Affect vs. effect

Question

When does one use "affect" and when does one use "effect"?

Answer 1

"Affect" is a verb that means "to influence," while "effect" is usually used as a noun.

"She didn't want her advice to affect my decision."

"She didn't want her advice have an effect on my decision."

The exception to this is a rarer use of "effect" as a verb, where it means "to bring about."

For example, you can say that someone "effects change."

Answer 2

1. Affect is used as a verb. It means "to influence " or to "act". For example: John's grumpiness affected everyone.
2. Effect is used as a noun. It means "a result". For example: Smiling can have a real effect on your mood.

Answer 3

Affect is used as a verb - The Supreme Court decision will affect laws in the area.

Effect is used as a noun - The earthquake had devastating effects on the community.