There are many different ways to communicate with a robot. Robots are most often controlled using a tether (wired), wirelessly or autonomously. Tethered The easiest way to control a robot is using a handheld controller connected physically to the robot using wires or a cable.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/tutorials/show/basics-how-do-i-control-my-robot