USB-A (Type A): The rectangular USB Type-A connector approximately 1.4 cm (9/16 in) length by 0.65 cm (1/4 in) height is typically used for wired mice and keyboards. USB sticks normally feature USB-A connectors also.
USB-B (Type B): Less common than type A, USB B devices are nearly square in shape and are commonly found on routers, computers, printers, and game consoles
Micro USB: So-called Micro USB versions of both USB-A and USB-B also exist - smaller versions than their base counterparts, popular on mobile devices. Older but now obsolete "mini USB" versions can also be found on many old devices.
USB Type C: With dimensions of 0.84 cm by 0.26cm, this newer standard is designed to replace both A and B with smaller ports to better support the thinner form factors of mobile devices.
