Bed base

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A bed base, sometimes called a foundation, is the part of a bed that supports the mattress. The bed base can itself be held in place and framed by the bedstead (bed frame). In the United States, box-spring bed bases are very common (to the point where 'bed base' and 'box spring' may be used synonymously, and the term "platform bed" is used for any other type of bed base). In Europe, sprung slats are much more common.

Typically the measurements of a foundation will be about 1–2 inches (2.5–5.1 cm) shorter than the measurements of a mattress. In hot climates, mattress may be omitted.