Robots replace humans in performing repetitive and dangerous tasks which are guided by a computer program or electronic circuitry. The goal of a robot is to reach remote areas and perform various tasks such as locomotion, sensing harmful gases, metal detection, sound sense, live video streaming and so on. Since these robots perform many functions, they are referred to as multifunctional robots. There are various types of robots. Robots which are used to keep an eye, supervisory control on intrusion thereby function as spy robots. Military robots are used to carry out many risky jobs that cannot be done by the soldiers, thereby saving human lives and reducing manual error in the field of defense. A wireless multipurpose robot can be navigated around the disaster areas to find the humans who need help and also to identify forest fire. Combat robot is designed to tackle cruel terror attacks which can be radio operated, self-powered and has all the controls like a combat vehicle. Soft spider robots are used to perform delicate surgical procedures in the human body which is too unpredictable to be performed by rigid robots. Camouflage robot is designed to duplicate the colors on which it moves on, hence being impersonated by the outside world. Rescue robots are a type of mobile robots which are used to complete search and rescue missions during natural disasters and other emergency situations. Therefore, robots play a very important role in making the tasks performed by humans easier, faster and efficient, thereby increasing speed and productivity.