PPA in Linux Mint 20

[abhishek (Abhishek Prakash)]

@easyt50

So every time I use the apt command, it uses the list of PPA’s found on my system to search thru. And if the item is not found I get the message ‘Unable to loacate package …’. Is this true for all apt commands, even the ones for the Distro itself?

Almost yes. PPA means custom repositories. When you use apt to install an application, your system searches for the application in all the repositories added to your system. If it finds the application (with exact same name) in more than one repositories, it installs from the repository that has the newer version of the application.