Do the interior walls of the house need to be waterproof? How?

The bathroom wall needs to be waterproof, which is the standard of building decoration and can not be ignored. If it is not waterproof for a long time, it will also affect the living, because there must be a room next to your bathroom, and there are simple decorations on the wall. If your hygiene is not waterproof for a long time, the water on the bathroom wall will corrode easily and affect your other rooms, so it is necessary to waterproof the bathroom wall.