There are several major crimping systems used in interconnect systems around the world. The most common are the FCI Berg Clincher style, Tyco (AMP) style, and Nicomatic CrimpFlex style. These systems differ in their crimp method and market share varies by region. The document also provides information on the types of contacts, housings, and how they connect and mate to different components like cables, PCBs, and receptacles.