Canon EF lenses are a series of interchangeable camera lenses designed for use with Canon digital single-lens reflex (DSLR) cameras. Introduced in 1987, these lenses feature an electronic communication system that allows for faster autofocus and improved exposure control. They come in various focal lengths and apertures, catering to different photography styles and needs. These lenses are categorized into several types, including prime lenses, which have a fixed focal length, and zoom lenses, which offer variable focal lengths. Canon EF lenses are known for their optical quality and durability, making them popular among both amateur and professional photographers.