Linux - Debian - package manager

To manage some packages you can use apt or aptitude application.
Apt application contains:
- apt-get - tool used for managing packages (do not use it anymore)
- apt-cache - tool used for managing cached packages
- apt-cdrom tools used for managing packages there are on the CD-ROM
- apt-key - for key management.

Nowadays trends tell linux users to avoid of using apt-get and use aptitude.