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So, what exactly does the 
apt-add-repository
 command do? Honestly, it's not all 
that amazing. When you install a PPA, it's essentially automating the process of 
adding a repository file to your 
/etc/apt/sources.list.d
 directory and installing its 
key. Therefore, you can uninstall a PPA by simply deleting its file.
PPAs are one of the things that sets Ubuntu apart from Debian and can be a very 
useful feature if harnessed with care. PPAs offer Ubuntu a flexible way of adding 
additional software that wouldn't normally be made available, though you will 
need to keep an eye on such repositories to ensure they are properly patched when 
vulnerabilities arise and are used only when absolutely necessary. Always prefer 
packages from Ubuntu's default repositories as well as Snaps, but PPAs offer you 
another option in case you can't find what you need anywhere else.
After you've maintained a server for a while, or finished setting it up for a particular 
goal, you'll have installed a plethora of packages to suit its purpose. Exporting a list 
of installed packages can make it easier to rebuild a server should the need arise, and 
we'll look at one method of doing that in the next section.