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A kiss is the touching of one person's lips to another place, which is used as an expression of affection, respect, greeting, farewell, good luck, romantic affection or sexual desire. The word comes from Old English cyssan "to kiss", in turn from coss "a kiss".

It is described as "an act expressive of endearment," as something "most natural," according to Dyer. Sir Richard Steele writes, "Tis certain, Nature was its author and it began with the first courtship." "From its very infancy, the act of kissing has been handed down as the natural expression of affection," and "of all acts the most universal." However, kissing was unknown until modern times to certain races, including aborigines, Tahitians, and many tribes in Africa.