A pool skimmer is a device used to remove debris from the surface of a swimming pool. It typically consists of a floating or stationary unit that collects leaves, insects, and other floating materials. The skimmer works by drawing water into its basket, where the debris is trapped, allowing clean water to return to the pool. Most in-ground pools have built-in skimmers, while above-ground pools often use portable models. Regular use of a pool skimmer helps maintain water clarity and hygiene, reducing the need for extensive cleaning and chemical treatments. Proper maintenance of the skimmer is essential for optimal performance.