Una cadena es un conjunto de eslabones o anillos enlazados entre sí, que sirven para sujetar, estirar y para la transmisión de movimiento en las máquinas. Es un objeto construido mediante eslabones, generalmente metálicos, que se entrelazan unos a otros. Han sido utilizadas desde antiguo debido a su fortaleza combinada con flexibilidad. Sus usos van desde seguridad para mantener algo sujeto, para esto se necesita un candado que una ambos extremos y para sostener objetos de gran peso.

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A chain is a series of connected links which are typically made of metal. A chain may consist of two or more links. \n* Those designed for lifting, such as when used with a hoist; for pulling; or for securing, such as with a bicycle lock, have links that are torus shaped, which make the chain flexible in two dimensions (The fixed third dimension being a chain's length.) \n* Those designed for transferring power in machines have links designed to mesh with the teeth of the sprockets of the machine, and are flexible in only one dimension. They are known as roller chains, though there are also non-roller chains such as block chain. Two distinct chains can be connected using a quick link which resembles a carabiner with a screw close rather than a latch.

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