USB Type A connectors, officially called Standard-A connectors, are flat and rectangular in shape. Type A is the original USB connector and is the most recognizable and commonly used connector. USB Type-A connectors are supported in every USB version, including USB 3.0, USB 2.0, and USB 1.1.USB 3.0 Type A connectors are often, but not always, the color blue.ype A is the original USB connector and is the most recognizable and commonly used connector. USB Type-A connectors are supported in every USB version, including USB 3.0, USB 2.0, and USB 1.1. USB 3.0 Type A connectors are often, but not always, the color blue.