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back stack allow us to reverse a Fragment transaction on pressing Back button of device. While performing Fragment Transaction we can add a Fragment into back stack that’s managed by the Activity. We can manipulate each Fragment independently, such as add or remove them. We can create Fragments by extending Fragment class or by inserting a Fragment into our Activity layout by declaring the Fragment in the activity’s layout file, as a  element. Important Related Read: Fragment Lifecycle We always need to embed Fragment in an activity and the fragment lifecycle is directly affected by the host activity’s lifecycle. We can combine multiple Fragments in Single Activity to build a multi panel UI and reuse a Fragment in multiple Activities. It represents a behaviour or a portion of user interface in an Activity. It will not be wrong if we say a fragment is a kind of sub-activity. In Android, Fragment is a part of an activity which enable more modular activity design. Fragment Tutorial With Example In Android Studio