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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.
In its most common usage, affect is a verb; to affect something is to make an impact on something. In its most common usage, effect is a noun and is usually followed by the preposition on; things have an effect on other things. When used as a verb. As a verb, to affect something means to cause it to change in some way.