A toilet flange is a piece that attaches the drain pipe from your toilet bowl to other pipes in your bathroom. A loose toilet flange may be difficult to spot at first.
A closet bend, or closet flange, is the curved part of piping found beneath sinks and toilets. The bend connects two straight pieces of piping together and helps ensure wastewater flows away from the fixture and into your drainage system. It's called a "bend" because it curves 90 degrees to join with other parts of plumbing, like plastic or copper pipes.