Debian Stable is extremely stable, but it’s also very slow moving. As a result, you can get stuck with ridiculously outdated software. The backports repositories allow you to install newer versions of some software on your Debian Stable system. This guide explains how to use backports on Debian Stable.
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-install-and-use-debian-backports