How many standard USB connectors are there?

There are several standard USB connector types, including USB Type-A, USB Type-B, Mini-USB, and Micro-USB. Additionally, USB Type-C has become increasingly popular due to its reversible design and higher data transfer capabilities. Each type serves different purposes and devices, contributing to the overall diversity of USB connectors. Overall, there are more than a dozen variations, but the main standard types are generally classified into these categories.