IT Glossary - D - ITU Online

IT Glossary
Key Terms To Know In The IT Industry

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Data Warehouse

A system used for reporting and data analysis, and is considered a core component of business intelligence.

You will find this term commonly used in General IT, Networking

Data Warehousing

The electronic storage of a large amount of information by a business, in a manner that is secure, reliable, easy to retrieve, and easy to manage.

You will find this term commonly used in General IT, Networking

Data Wrangling

The process of cleaning, structuring and enriching raw data into a desired format for better decision making in less time.

You will find this term commonly used in General IT, AI

Data-driven Decision Making

Making decisions based on data analysis rather than intuition or observation alone.

You will find this term commonly used in General IT, Business

Database (DB)

A structured set of data held in a computer, especially one that is accessible in various ways.

You will find this term commonly used in General IT, Networking

Database Administration

The function of managing and maintaining database management systems (DBMS) software.

You will find this term commonly used in General IT, Security

Database Administration (DBA)

The function of managing and maintaining database management systems (DBMS) software.

You will find this term commonly used in General IT

Database Administrator (DBA)

Manages and maintains database systems to ensure security, integrity, and performance.

You will find this term commonly used in Database Management

Database as a Service (DBaaS)

A cloud service model that provides users with access to a database without the need for setting up physical hardware, installing software, or configuring for performance.

You will find this term commonly used in Networking, General IT

Database Caching

A technology used to increase the speed of data retrieval by storing a copy of datasets in a temporary storage space known as a cache.

You will find this term commonly used in General IT, Networking

Database Clustering

The use of two or more servers, or nodes, with a database management system software that is designed to store and deliver the database services.

You will find this term commonly used in General IT, Networking

Database Index

A data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure.

You will find this term commonly used in General IT

Database Indexing

A data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure.

You will find this term commonly used in General IT

Database Management

The process of defining, manipulating, retrieving and managing data in databases.

You will find this term commonly used in General IT

Database Management System (DBMS)

A software package designed to define, manipulate, retrieve, and manage data in a database.

You will find this term commonly used in General IT, Networking

Database Migration

The process of moving databases from one platform to another, which may involve converting the database to a new format or adapting it to new software.

You will find this term commonly used in General IT

Database Mirroring

A solution for increasing the availability of a SQL Server database by copying its data to a secondary database.

You will find this term commonly used in General IT, Networking

Database Normalization

The process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.

You will find this term commonly used in General IT

Database Query

A request for data or information from a database table or combination of tables.

You will find this term commonly used in General IT, AI

Database Schema

The structure of a database described in a formal language supported by the database management system (DBMS).

You will find this term commonly used in General IT

Database Security

Measures that ensure that the data stored in a database is protected from compromise and that the data management operations are performed securely.

You will find this term commonly used in Security, Cybersecurity

Database Server

A server that provides database services to other computer programs or computers, as defined by the client-server model.

You will find this term commonly used in Networking, General IT

Database Sharding

A type of database partitioning that separates very large databases the into smaller, faster, more easily managed parts called data shards.

You will find this term commonly used in Networking, General IT

Database Snapshot

A read-only, static view of a database (usually for backup or reporting purposes) that reflects the data at a particular point in time.

You will find this term commonly used in General IT, Networking

Database Transaction

A unit of work performed within a database management system (or similar system) against a database, and treated in a coherent and reliable way independent of other transactions.

You will find this term commonly used in General IT

Datacenter Networking

The network infrastructure, tools, and methodologies used to connect and manage resources and data flow within and between data centers.

You will find this term commonly used in Networking, General IT

Datagram

A basic transfer unit associated with a packet-switched network, which is a small packet of information that travels through a network independently of other datagrams.

You will find this term commonly used in Networking

DDoS Attack (Distributed Denial of Service Attack)

An attempt to disrupt the normal traffic of a targeted server, service, or network by overwhelming the target or its surrounding infrastructure with a flood of Internet traffic.

You will find this term commonly used in Security, Cybersecurity

Debugging

The process of finding and resolving defects or problems within a computer program that prevent correct operation.

You will find this term commonly used in General IT

Debugging Tool

Software for testing and debugging programs and applications.

You will find this term commonly used in General IT

Decentralized Application (DApp)

An application that runs on a distributed computing system.

You will find this term commonly used in General IT, Security

Decentralized Autonomous Organization (DAO)

An organization represented by rules encoded as a computer program that is transparent, controlled by the organization members and not influenced by a central government.

You will find this term commonly used in Security, Cybersecurity

Decentralized Finance (DeFi)

Financial software built on blockchain technology that enables peer-to-peer transactions without the need for traditional financial intermediaries.

You will find this term commonly used in Security, Cybersecurity

Decentralized Identifier (DID)

A new type of identifier that enables verifiable, self-sovereign digital identities. DIDs are fully under the control of the DID subject, independent from any centralized registry, identity provider, or certificate authority.

You will find this term commonly used in Security, Cybersecurity

Decentralized Network

A network structure in which some functions and decisions are decentralized to individual or local units.

You will find this term commonly used in Networking, Security

Decision Support System (DSS)

An information system that supports business or organizational decision-making activities.

You will find this term commonly used in General IT, AI

Decryption

The process of converting encrypted data back into its original form, so it can be understood.

You will find this term commonly used in Security, Cybersecurity

Deep Fake

Synthetic media in which a person in an existing image or video is replaced with someone else's likeness using artificial neural networks.

You will find this term commonly used in AI, Security

Deep Learning

A subset of machine learning in artificial intelligence (AI) that has networks capable of learning unsupervised from data that is unstructured or unlabeled.

You will find this term commonly used in AI

Deep Linking

The use of a hyperlink that links to a specific, generally searchable or indexed, piece of web content.

You will find this term commonly used in General IT, Networking

Deep Packet Inspection (DPI)

A form of computer network packet filtering that examines the data part (and possibly also the header) of a packet as it passes an inspection point.

You will find this term commonly used in Networking, Security

Deep Web

The part of the web that is not indexed by standard search engines.

You will find this term commonly used in Security, General IT

Default Gateway

The device that passes traffic from the local subnet to devices on other subnets.

You will find this term commonly used in Networking

Defense in Depth

A strategy that employs a series of mechanisms to slow the advance of an attack aimed at acquiring unauthorized access to information.

You will find this term commonly used in Security, Cybersecurity

Defragmentation

The process of consolidating fragmented files on a user's hard drive.

You will find this term commonly used in General IT

Delay Tolerant Networking (DTN)

An approach to computer network architecture that seeks to address the technical issues in heterogeneous networks that may lack continuous network connectivity.

You will find this term commonly used in Networking

Delegation

In computing, the process whereby an object or method passes on a task to another object or method. It's often used in reference to security delegation, where a user or process delegates permissions to another user or process.

You will find this term commonly used in General IT, Security

Delete

The operation of removing data from a database or removing a file from a filesystem.

You will find this term commonly used in General IT

Denial of Service (DoS) Attack

An attack meant to shut down a machine or network, making it inaccessible to its intended users by overwhelming it with traffic or sending it information that triggers a crash.

You will find this term commonly used in Security, Cybersecurity

Denormalization

The process of attempting to optimize the read performance of a database by adding redundant data or by grouping data.

You will find this term commonly used in General IT, Networking

What's Your
Career Path?
Information Security Analyst Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
54 Hrs 29 Min
icons8-video-camera-58
215 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
AWS Cloud Practitioner Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
62 Hrs 59 Min
icons8-video-camera-58
473 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
IT Project Manager Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
36 Hrs 58 Min
icons8-video-camera-58
151 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Pentester Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
96 Hrs 49 Min
icons8-video-camera-58
419 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Video Editor Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
24 Hrs 3 Min
icons8-video-camera-58
154 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Cisco Network Engineer Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
126 Hrs 29 Min
icons8-video-camera-58
459 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Network Administrator Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
158 Hrs 43 Min
icons8-video-camera-58
511 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Comprehensive IT User Support Specialist Training: Accelerate Your Career

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
121 Hrs 41 Min
icons8-video-camera-58
610 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Web Designer Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
33 Hrs 38 Min
icons8-video-camera-58
171 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
IT Manager’s Survival Bundle Training Series – 10 Courses

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
172 Hrs 23 Min
icons8-video-camera-58
768 On-demand Videos

Original price was: $179.00.Current price is: $47.40.

Add To Cart
Certified Ethical Hacker Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
126 Hrs 41 Min
icons8-video-camera-58
804 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart
Entry Level Information Security Specialist Career Path

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

Total Hours
109 Hrs 39 Min
icons8-video-camera-58
502 On-demand Videos

Original price was: $129.00.Current price is: $51.60.

Add To Cart