The most commonly used third-party repository is https://rpmfusion.org/[RPM Fusion]. It provides packages that can not be included in Fedora because of US software patents or other similar reasons. Among other things, RPM Fusion provides packages necessary for viewing media in many common formats. RPM Fusion packages are extensively tested, but they are not supported by the Fedora project.
A set of repositories for Fedora is known as https://copr.fedorainfracloud.org/[Copr]. Developers can provide packages in Copr repositories for software that is not at present included in Fedora. *These packages might be untested.*
Certain non-free applications for Linux, such as Google Chrome or Skype, provide their own repositories for Fedora.
To install software from a third-party repository, you must first _enable_ that repository. Then the packages from the repository become available in the command line and graphical package management tools.
IMPORTANT: If you enable a third-party repository, packages that you did not explicitly select might also be installed from the repository. Do not enable repositories that you do not trust. The Fedora project does not support third-party repositories.
