Affection or fondness is a "disposition or state of mind or body" that is often associated with a feeling or type of love. It has given rise to a number of branches of philosophy and psychology concerning emotion, disease, influence, and state of being. "Affection" is popularly used to denote a feeling or type of love, amounting to more than goodwill or friendship. Writers on ethics generally use the word to refer to distinct states of feeling, both lasting and spasmodic. Some contrast it with passion as being free from the distinctively sensual element.

Even a very simple demonstration of affection can have a broad variety of emotional reactions, from embarrassment, to disgust, pleasure, and annoyance. It also has a different physical effect on the giver and the receiver.