What is addToBackStack in Fragment

Fragment API unlike Activity API does not come with Back Button navigation by default. So if you have added or replaced many Fragments on a Fragment container. There is no way to go back to the previous Fragment on a Back Button Pressed.

Let's see the difference between the behaviors

Case 1: Default behavior

getSupportFragmentManager()
            .beginTransaction()
            .add(R.id.fragmentContainer, fragment, "TAG")
            .commit();

Case 2: With addToBackStack

getSupportFragmentManager()
            .beginTransaction()
            .add(R.id.fragmentContainer, fragment, "TAG")
            .addToBackStack("TAG")
            .commit();

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