Module description: Molecular motors are complex protein assemblies that consume energy in one form and convert it into motion. Many protein-based molecular motors harness the chemical free energy released by the hydrolysis of ATP in order to perform mechanical work. These motors transport a wide variety of cargo, power cell locomotion, drive cell division and, when combined in large ensembles, allow organisms to move. There are many kinds of molecular motors, including linear motors myosin, kinesin and dynein, chaperones, rotary motors like the F1 ATPase and bacterial flagella, nucleic acid motors such as helicases and topoisomerases, and the motors responsible for peptide and nucleic acid translocation during ribosomal protein synthesis. Besides biological, Synthetic molecular motors have been created by chemists that yield rotation, possibly generating torque. Currently these motors suffer many limitations that confine their use to the research laboratory, but many limitations may be overcome as understanding of chemistry and physics at the nanoscale increases.