The term 'Sink Obstruction' can be summarized as a CLOG, which is a four-letter word. A CLOG is an obstruction in a sink, usually caused by a buildup of debris such as hair, food particles, and soap scum. This buildup can cause the sink to become blocked, making it difficult or impossible to use. Clogs can be removed with a plunger or other tools, but if the CLOG is too severe, a professional plumber may need to be called.