Final answer:
A mnemonic device is a memory aid that helps a person remember information. One commonly used mnemonic device is the acronym.
Step-by-step explanation:
A mnemonic device is a memory aid that helps a person remember information. One commonly used mnemonic device is the acronym. An acronym is a word or phrase formed by the first letters of other words. For example, the mnemonic device 'DARN CAT' represents the preparation and action stages of a process. Each letter in 'DARN CAT' stands for a different step, making it easier to remember the order of those steps.