Fiber Optic Adapter includes FC, SC, ST, LC, FC/APC, SC/APC, LC/APC, mating sleeves, hybrid fiber optic adapters, Single mode fiber optic adapters, multimode fiber optic adapters. Fiber optic adapters are used in fiber optic connection, the typical use is to provide a cable to cable fiber connection. People sometimes also name them to be mating sleeves and hybrid adapters, mating sleeves means this fiber optic adapter is used to connect the same type fiber optic connectors, while hybrid adaptors are the fiber optic adapter types used to connect different kinds of fiber optic connectors.