A circlip is a type of fastener used to secure components on a shaft or in a housing. It is typically made of spring steel and has a circular shape with a gap that allows it to be easily installed and removed. Circlips come in two main types: internal and external. Internal circlips fit inside a bore, while external circlips fit around the outside of a shaft. These fasteners are commonly used in various applications, including automotive, machinery, and electronics. They help prevent parts from moving out of position, ensuring the proper functioning of devices. Circlips are often used in conjunction with other components like bearings and gears to maintain assembly integrity.