The document discusses the history and use of flashlights on smartphones. It notes that while flashlight apps were once common, they were often buggy and filled with ads. Apple addressed this by adding a built-in flashlight function to the Control Center that can be easily accessed from any screen without unlocking the phone. The summary explains how to operate this flashlight by swiping up from the bottom of the iPhone screen to open Control Center and then tapping the small flashlight icon.