The document discusses the history of flashlight apps and the built-in flashlight feature on iPhones. It notes that flashlight apps used to be common but were buggy, so Apple decided to add a flashlight directly to the Control Center of iOS. It explains that the iPhone's flashlight will stay on until the phone is powered off or the battery dies, unlike a physical flashlight. It concludes by detailing how users can access the iPhone's flashlight by swiping up from the bottom of the screen to open the Control Center and tapping the flashlight icon.