Home security is a multi-tiered process of various tools and equipment to make sure your home is safe. The most basic parts are security, deterrents, and alarms. Security devices like locks keep people out of your home. Deterrents like flood lights help to prevent crime by exposing any suspicious activity. Finally, alarms serve as a last resort if your home is entered by an intruder. These notify you of a presence and scare off criminals as well.