(1) Short for Disk-based Data Protection, where a disk or RAID system is used as a data backup and archival system in place of tape.

(2) Short for Distributed Data Protection, a managed (or hosted) service that provides customers with online, scheduled, automated computer system data backup and self serve restoration.

(3) Short for Development Data Platform, a Web-based platform for data analysis, presentation and dissemination.

(4) Short for Distributed Data Processing, a data processing network where some functions are performed in different places on different computers and are connected by transmission facilities.

Webopedia's "Did You Know... Understanding Storage"
The world of storage can be forbidding to a novice. Even veteran IT personnel may be put off by the sheer volume of new terminology and alphabet soup that has evolved.