Can I use PPAs on Debian?

Updated 01-Oct-2023

PPAs are personal package archives that allow people to distribute application packages to Ubuntu distributions. Since Ubuntu is based on Debian, and PPA packages are in the .deb format, they can theoretically be used in Debian. However, there are several complications that need to be understood:

At the end of the day, I do use I think one PPA for installation, the obsproject / obs-studio program.

If you want to install Firefox on Debian, then another PPA is needed.