From SCP: Secret Laboratory English Official Wiki

SCPs are anomalies that have been captured by the Foundation.

SCPs are stored within numerous sites owned by the Foundation across the world; these sites including places such as Site-48, Site-17 and Site-02, the last site being where SCP SL takes place.

While some anomalies can either be harmful or hostile, others can be very beneficial if used correctly. The following SCPs are found in-game.