SC fiber optic connector 
SC fiber optic connector is used with push-pull style; it is one of the earliest and most commonly used types.

FC fiber optic connector
FC is with metal housing, screw structure.

ST fiber optic connector
ST fiber optic connector is also a metal structure, push-pull style. ST are usually used in 10Base-F while SC usually used in 100Base F, ferrule of ST fiber optic connector is exposed outside.

LC fiber optic connector
LC is the short form for the company name Lucent, with push and pull. Size of ferrules and sleeves used in LC fiber connector and LC fiber adaptor is half of SC and FC, it is 1.25mm.

MT-RJ fiber optic connector
MT-RJ was developed based on NTT's MT connector, and with the RJ-45 style structure. Widely used for data transmission.

MU fiber optic connector
MU Miniature Unit coupling, is the smallest single ferrule fiber optic connector in the world, so it is good choice for dense installations. Popular with the wide use of DWDM.

E2000 fiber optic connector
E2000 fiber optic connector is one of the newest, which features a spring-loaded shutter used to protect the ferrule from dust and scratches.