The answer to a clogged toilet is that there are several common causes, including a blocked drain, a buildup of debris, or a problem with the toilet's flushing mechanism. Symptoms of a clogged toilet include slow draining, water not going down fully, or a toilet that won't flush at all.
For minor clogs, you can often fix the issue yourself using a plunger or a toilet auger (also called a plumber's snake). Start by plunging the toilet vigorously, and if that doesn't work, use the auger to try to clear the blockage. If the clog is severe or you can't get the toilet unclogged, it's best to call a professional plumber who can properly diagnose and fix the problem.