In general, a term is a word, phrase, or expression made up of many words to describe a thing or concept. For example, a computer mouse is a computer-related term (terminology) that describes a hardware input device used with the computer.
Why should I learn computer terms?
When dealing with computers, it's important to be familiar with the terminology used to better understand computers and interact with other computer users. For example, someone could call their monitor or computer the "CPU" (central processing unit) when unfamiliar with what a CPU is in the computer. If they had a problem with their monitor turning on and searched for "CPU not turning on," they'd find many results not relating to their problem.
Our glossary of computer jargon has thousands of definitions and explanations that are easy to browse.