Nanosensors are sensors whose active elements include nanomaterials. There are several ways being proposed today to make nanosensors; these include top-down lithography, bottom-up assembly, and molecular self-assembly.These are also used to detect the presence of pathogens like bacterias, virus, etc. Medicinal uses of nanosensors mainly revolve around the potential of nanosensors to accurately identify particular cells or places in the body in need.