The answer to 'why is my drain' is that there are several common causes for a clogged or slow-draining drain, including hair, soap scum, food particles, and other debris buildup. Symptoms may include standing water, gurgling sounds, or foul odors coming from the drain.
Some potential solutions include using a plunger, a drain snake or auger, or a chemical drain cleaner. However, if the clog is severe or the problem persists, it's best to call a professional plumber who can properly diagnose and fix the issue.