Affect is usually used as a verb meaning to influence or produce a change in something, whereas effect is generally used as a noun that refers to a change resulting from something.
Affect and effect are two of the most commonly confused words in English, but don’t worry—we’ll help you keep them straight. The basic difference is this: affect is usually a verb, and effect is usually a noun. Affect, when used as a verb, means "to act on or change someone or something."