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Fragment represents a piece of the application's visual interface that can be reused and reused. A fragment can have its layout file, fragments have their lifecycle. Fragments cannot live on their own- they must be hosted by an activity or another fragment. For interaction between fragments, the FragmentManager uses FragmentTransaction for adding, deleting, and other actions with a fragment to conduct a transaction. The Fragment Manager is used - a special fragment manager. The Android OS world is quite fragmented and consists of many devices.