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In psychology , affect is used to describe mood, especially a change in mood. However, while affect may describe mood, the two are completely different in meaning. Mood is a state of feeling (emotional), usually temporary, resulting from a specific stimulus. The word is derived from an ancient English word âmodâ which meant courage especially during war times.
Most of the time, you'll want affect as a verb meaning to influence something and effect for the something that was influenced. The difference between affect and effect is so slippery that people have started using impact as a verb instead. Don't be one of them!