molecular machine

A molecular machine is a tiny structure made of molecules that performs specific functions by moving or changing shape, similar to a mechanical machine but at an atomic or molecular level. These natural or synthetic systems can convert energy into motion, enabling processes like muscle contraction, DNA replication, or targeted drug delivery. Because they operate on such a small scale, their design and behavior are governed by the principles of chemistry and physics, allowing precise control of movements within biological cells or nanotechnology applications. Molecular machines showcase how nature and science harness molecular interactions to create functional devices at microscopic scales.