Final answer:
A protocol is a set of rules that governs data communication, including error detection, message length, and transmission speed.
Step-by-step explanation:
A protocol is a set of rules that governs data communication.
It includes error detection, message length, and transmission speed.
For example, the Transmission Control Protocol (TCP) is a widely used protocol that ensures reliable communication over the internet by breaking data into packets, checking for errors, and reassembling them at the destination.