What is a PPA for on Ubuntu or Linux Mint?

• PPA stands for Personal Package Archive
• It allows apps to be installed that are not in the Ubuntu/Mint repositories
• Provides access to newer software

Example - add PPA for apt-fast

•  On Ubuntu or Linux Mint from a terminal for a 64 bit OS :

$ sudo add-apt-repository ppa:apt-fast/stable 
$ sudo apt-get update 
$ sudo apt-get install apt-fast

• This allows 'apt-fast' to be installed which is not in the standard repositories