Activity is typically a single, focused operation that a user can perform such as dial a number, take a picture, send an email, view a map etc.
Fragment is a modular section of an activity, with its own lifecycle and input events, and which can be added or removed at will. Also, a fragment’s lifecycle is directly affected by its host activity’s lifecycle i.e. when the activity is paused, so are all fragments in it, and when the activity is destroyed, so are all of its fragments.
