Short for Debian package. Debian is a not-for-profit organization that creates a Linux distribution. Linspire is based on the Debian distribution.
This is a binary file format that is used by Debian and Debian-based distributions. This will be the suffix of a file specifically for these distributions. An example would be koffice-1.2.deb. For more information on installing these files, refer to the Debian Web Site.
Debian software package format and the most often used name for such binary packages. Like the term Debian, it's named after Debra, wife of Debian's founder Ian Murdock.