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D
Data
The plural of the term datum, a single piece of information. Software is divided into two general categories, software and data. Programs are collections of instructions for manipulating data. On a computer, data is stored as bytes, units of storage capable of holding a single character.

Database
A database is a way of storing information in categories. A computer database is a software package that is able to store lists of repetitive data, linked by keys, or common characteristics.

Domain Name
Every computer on the Internet has a discreet numerical address, known as an IP address. (Eg. 38.122.150.42)
To make it easier, these are given names, such as open2.net.

DVD-ROM
A DVD-ROM (Digital Versatile Disk Read Only Memory) is for permanent data storage. It’s like a CD-ROM but holds much more data - up to 17 gigabytes (GB).