End milling is a machining process used to create complex shapes and features on a workpiece. It involves a rotating cutting tool, known as an end mill, which has multiple cutting edges. This tool moves vertically and horizontally to remove material from the surface, allowing for precise shaping, contouring, and finishing of various materials, including metals and plastics. This technique is commonly employed in CNC (Computer Numerical Control) machining, where computer programs control the movement of the end mill for accuracy. End milling can produce slots, pockets, and intricate designs, making it essential in manufacturing industries such as aerospace, automotive, and tooling.