Original: PCLinuxOS uses APT-RPM, based on Advanced Packaging Tool (or APT), a package management system (originally from the Debian distribution), together with Synaptic Package Manager, a GUI front-end to APT, in order to add, remove or update packages.
Simplified: PCLinuxOS uses the Advanced Packaging Tool (or APT), a package management system (originally from the Debian distribution), together with Synaptic Package Manager, a GUI frontend to APT, in order to add, remove or update packages.