Memory

Memory is a computer's capacity for doing work. If a computer has low memory, it may not be able to process much at all. Contrastly, if it has high memory, it can do plenty at once.

In laymans terms, memory measures how much a computer can do. If a computer were like a person lifting weights, a computer with lots of memory would be a like a bodybuilder lifting very heavy weights with little effort. A computer with low memory would be like a baby trying to lift 100 pounds; such a workload could not be done.