Packages are applications that are packaged up to make them easier to install.

A group of Packages are contained in a Software Repository.

A software repository can store its files on one server or across many different servers known as mirrors.

Ubuntu/Debian based distributions utilize the .deb package format whereas Red Hat based distributions utilize rpm packages.

Add local directory to apt sources.list

Automatically installed packages

Automatic updates

Check if a package is installed

Cleanup Packages

Determine which package a file belongs to

Extract deb file without having dpkg

Find Large Packages

Find Package Dependencies

Install a local .deb file

Install a package

Installing experimental packages

Installing unstable packages

Linux Distribution Equivalents

List all packages installed on the system

List the files installed by a package

Package Priorities

Purge a package

Re-install a package

Remove a package

Remove Config Files

Remove Unused Kernels

Search packages

Uninstall a package

Update the packages list

Upgrade the packages

Verify the files of installed packages are still exactly like they were when they got installed