There are many types of wire connectors out there but these are some of the most common ones you'll encounter.
The two square holes on a USB stick/connector are crucial for ensuring a secure, firm connection to devices. USB Type-A connectors use spring-loaded clips that engage with the square holes to secure ...
USB Type-A. USB Type-B. Mini-USB Type-A. Mini-USB Type-B. Micro-USB Type-A. Micro-USB Type-B. That special, ugly variant of micro-USB Type-B you need to use for phones (and some hard drives) with USB ...