The answer to 'why is my sink clogged' is that a clogged sink is typically caused by a buildup of debris, hair, food particles, or other materials in the drain pipe. This can restrict water flow and cause the sink to back up and overflow.
Common symptoms of a clogged sink include slow draining, standing water, and foul odors. To fix a clogged sink, you can try using a plunger, a drain snake, or a chemical drain cleaner. However, if the clog is severe or you're not comfortable doing it yourself, it's best to call a professional plumber to diagnose and address the issue.