A sock is an item of clothing worn on the feet. The foot is among the heaviest producers of sweat in the body, as it can produce over 0.25 US pints (0.12 l) of perspiration per day. Socks help to absorb this sweat and draw it to areas where air can evaporate the perspiration. In cold environments, socks decrease the risk of frostbite.

The modern English word sock is derived from the Old English word socc, meaning "light slipper". This comes from the Latin soccus, a term to describe a "light, low-heeled shoe" worn by Roman comic actors, and deriving from the Ancient Greek word sykchos.

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