Futuristic conceptual illustration of nanorobots delivering laser treatment to a tumour in the human body. Nanorobotics is the emerging technology field creating machines or robots whose components are at or close to the scale of a nanometer. The names nanobots, nanoids, nanites, nanomachines, or nanomites have also been used to describe these devices currently under research and development. A tumor (American English) or tumour (British English) is commonly used as a synonym for a neoplasm (a solid or fluid-filled cystic lesion that may or may not be formed by an abnormal growth of neoplastic cells) that appears enlarged in size. Tumor is not synonymous with cancer. While cancer is by definition malignant, a tumor can be benign, precancerous, or malignant. Laser medicine consists in the use of lasers in medical diagnosis, treatments, or therapies, such as laser photodynamic therapy