The term Affect generally suggests an emotion. It is used in various ways in various contexts:

• Affect (philosophy).
• Affect (psychology), referring to feeling or emotion.
• Affect display (psychology) refers to apparent signs of emotion, such as facial expression, vocalization, and posture
• Affective science, the scientific study of emotion.
• Any of several terms in abnormal psychology, including.

*Blunted affect or affective flattening, a reduction in emotional reactivity.

*Labile affect, the unstable display of emotion.

• Affective computing, an area of research in computer science aiming to simulate emotional processes.
• Affekt (the German term, which is often used in this context) in musical and other aesthetic theory. (The article currently redirects to Doctrine of the affections.)
• Doctrine of the affections, an important theory in musical aesthetics.

Please note that although the word "affect" is most commonly found in verb form, it also exists as a noun, and as such is often confused with the word "effect" (itself most commonly a noun, but occasionally found in verb form).