What is meant by using the replace method in fragment operations in Android?

In Android, the replace method in fragment transactions is used to replace one fragment with another in a container. Unlike add, which simply adds a new fragment on top, replace removes the current fragment from the container and adds a new one.

This is convenient when you need to switch the screen content without accumulating multiple fragments in one place.

Example usage:

FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null); // if you want to save it in the back stack
transaction.commit();

Here, replace will remove the current fragment from R.id.fragment_container and add newFragment. If you call addToBackStack(), the replacement will be reversible when pressing back.