The EF mount is a lens mount system developed by Canon for its line of digital single-lens reflex (DSLR) cameras. Introduced in 1987, it allows for a wide range of interchangeable lenses, providing photographers with flexibility in their creative choices. The mount features electronic contacts that enable communication between the camera body and the lens, facilitating autofocus and image stabilization. Over the years, the EF mount has evolved, leading to the creation of the EF-S mount for crop-sensor cameras and the RF mount for mirrorless systems. This compatibility ensures that photographers can use various lenses across different camera models, enhancing their photographic experience.