Drain blockages, also known as clogs, are a common plumbing issue caused by the accumulation of debris in pipes. This debris can include hair, grease, soap scum, and other materials that can build up over time and cause a blockage. Clogs can be removed using a variety of methods, such as plungers, drain snakes, or chemical cleaners. In some cases, professional plumbing services may be necessary to clear the blockage.