The answer to 'why is my toilet clogged' is that a toilet can become clogged for several common reasons, including flushing too much toilet paper, objects being flushed down the toilet, or a buildup of debris in the drain. Symptoms of a clogged toilet include the water not draining properly, the toilet bowl filling up with water, or water backing up into the bowl.
Some solutions you can try for a clogged toilet include using a plunger to dislodge the blockage, using a drain snake or auger to break up the clog, or using a chemical drain cleaner. However, if the clog is severe or you are unable to clear it yourself, it's best to call a professional plumber who can properly diagnose and fix the issue.