The answer to 'why is my drain clogged' is that drains can become clogged for a variety of reasons, such as hair, soap scum, food particles, or other debris buildup. Symptoms of a clogged drain include slow draining water, gurgling sounds, or even a complete blockage that prevents water from draining at all.
Some common causes of clogged drains include improper disposal of food and grease, excessive hair shedding, and the accumulation of soap and other personal care products. These can all contribute to a gradual buildup that eventually leads to a full blockage.