The Definition of a Robot Remains Vague Nowadays, people often see robots on television, in movies, or at exhibitions. However, answering the question, "What is a robot?" is not so easy. Some might say, "Isn't a robot just a metal thing with thick arms, short legs, big eyes, and a square head?" Others might add, "Isn't a robot just a machine? It can work non-stop; it's a kind of automatic machine." But these answers are not entirely accurate. Admittedly, robots can work automatically and are indeed machines, but robots are significantly different from automatic machines. Robots can mimic certain human movements, and they are equipped with computers, so they can remember information, process data, and make judgments about the external environment. One could say they possess a certain degree of intelligence. Some robots even have legs or walking mechanisms, and are no longer "stationary" machines. Robots also have many sensory organs—sensors—a significant technological advancement compared to automatic machines. Because the robot family is so large and there are so many experts researching robots, there is still no universally accepted definition. In terms of capabilities, a robot can be defined as "a humanoid machine that can replace humans to complete certain tasks and possess certain functions." Simply put, "a robot is a machine that moves like a human." It possesses some human characteristics and some machine characteristics. However, robots differ significantly from ordinary machines: they are flexible and versatile, capable of automatic movement and performing various operations. Robot Classification Similarly, there is no universally accepted classification of robots. Based on development level, robots can be divided into three generations. The first generation of robots is typically represented by teach-and-playback robots (these robots can automatically repeat actions once taught by a human using a teaching device or by hand); the second generation of robots are robots with senses that can adapt to changes in the external environment; the third generation of robots are intelligent robots. Based on application scope, robots can be divided into three main categories: 1. Industrial robots : These include handling robots that perform material handling work in factories, machining robots that can replace humans in operations, packaging robots, inspection robots, and painting robots. 2. Service robots . These include agricultural robots for agricultural production, livestock robots for raising fish and livestock, logging robots for forestry, nanny robots for household chores, nursing robots for caring for patients, robot dogs for guiding the blind, and secretary robots for assisting government officials with document processing and client reception. 3. Operational robots: These robots can perform complex tasks in environments difficult for humans to access or that are both dangerous and detrimental to health. Examples include space robots for space exploration, construction robots for building skyscrapers, robots working in power plants, robots for deep-sea salvage and exploration, and firefighting robots. Robots with Human-like Functions Some robots currently in use resemble humans in appearance, but some don't. Industrial robots, in particular, often resemble ordinary machinery. However, the components and functions of robots are similar to those of humans. Humans have a brain, hands, feet, sensory organs, muscles, and internal organs, while robots are composed of several parts similar to humans: a robotic hand (equivalent to a human arm and wrist), a locomotion system (equivalent to a human leg and foot), sensory devices (equivalent to the five human sensory organs), a drive system (equivalent to human muscles), and a control system (equivalent to some functions of the human brain). The robotic hand, located on the robot's body, is the main part responsible for operations. Its end cap is equipped with a gripper. To perform various tasks and operations, the robot's body and robotic hand often adopt a Cartesian coordinate system, similar to a gantry crane structure, allowing it to move up and down, left and right, and forward and backward, thus enabling the wrist at the end of the arm to reach any point within the working range. If joints are added to the wrist, allowing it to swing up and down, rotate left and right, and rotate around an axis, then the gripper on the wrist (along with the tool) can operate anywhere within the working range and in any direction. Robotic arms typically employ an articulated design, similar to a boom crane. The main body can rotate left and right around its base, while the upper arm rotates up and down relative to the main body, and the forearm rotates up and down relative to the upper arm, ensuring the wrist can reach any point within the working range. There are also two other articulation types for robotic arms: spherical coordinate and cylindrical coordinate. Robotic grippers come in various shapes and sizes, with grippers positioned on the arm, some of which are replaceable. Grippers hold manipulating tools. Robots commonly use wheels for movement. The wheels not only support the robot's body but also enable it to move forward, backward, left, right, and rotate. In the early 1990s, four-legged robots were developed abroad, and Russian scientists even created a six-legged robot. The primary reason for using multiple legs instead of two is to facilitate balance. However, the more legs there are, the more difficult it becomes to coordinate the movements between them. Therefore, more legs are not necessarily better. In 1990, the National University of Defense Technology of my country developed a bipedal walking robot, a highly advanced robot. The control device is, of course, an important part of the robot. It includes a computer and control circuits. The robot works and moves under the command of the control device. Humans move their limbs by issuing commands from the brain, with muscle contraction or relaxation pulling the bones of the limbs. The device that produces these movements in a robot is called a drive device. The drive device consists of motors, chains, levers, gears, etc. The power source of the drive device can be electric, pneumatic, or hydraulic. First-generation robots typically lack sensory devices. To make robots more powerful, perform better, adapt to the external environment, and adjust their movements according to external conditions, second-generation robots were developed that can see, hear, smell, and have a certain degree of recognition and judgment ability. For this purpose, sensory devices—sensors—must be equipped on these machines. The most important sensory devices for robots are visual devices (the robot's eyes), auditory devices (the robot's ears), and tactile, olfactory, gustatory, and proximity sensors. Second-generation robots with sensory devices also possess certain abilities in learning, association, and decision-making. With "eyes," robots can perform many complex tasks. For example, a robot that can "see parts" can assemble machines—finding the necessary parts and then installing them. Robots also need "eyes" to move, allowing them to see their position and determine their next move. If they encounter obstacles, their "eyes" must be able to see them clearly to decide whether to step over or go around them. With sensory devices, robots have even more functions. Robots with head-mounted light and smoke sensors will automatically sound an alarm in case of fire. These sensory devices are what robots use to sense external information. In fact, robots also have many other devices to sense internal information, controlling their movements and coordinating the work of their various parts. A Darling of the New Century Countries around the world attach great importance to the development of robots because, as a high-tech achievement, robots will bring enormous social productivity and wealth. Some Western scientists call the widespread use of robots the "Third Industrial Revolution." They believe that the First Industrial Revolution was the emergence of power, the Second Industrial Revolution was automation, and the Third Industrial Revolution's impact on humanity may far exceed the previous two revolutions. The benefits of widespread robot use to humanity are obvious. It increases output, improves product quality, and significantly enhances labor productivity. Robots can work tirelessly day and night without any special perks. Microstar drones can handle heavy, dangerous, and monotonous tasks, reducing labor intensity, improving working conditions, and protecting workers' lives, safety, and health. Therefore, even in a populous country like China, it is still necessary to vigorously develop robots and promote their use in industrial restructuring. This will help improve the technological level and labor productivity of enterprises, freeing workers from monotonous and tedious labor, allowing them to use the saved manpower for creative activities such as technological innovation, and enhancing competitiveness in domestic and international markets. In the new century, robots will gradually enter homes, providing people with a wide range of services. The use of robots… While this will certainly lead to some unemployment, it will also create new job opportunities. With the widespread use of robots, the robot manufacturing and repair industries will become one of the largest industries in the future. The programming, operation, supervision, and maintenance of robots all require a large number of skilled technicians and experts. The promotion of advanced technologies such as robots will change the social employment structure, with more people moving into technology-intensive industries to engage in creative labor. my country's superior social system allows the advantages of robots to be fully utilized. Currently, robots have entered the third generation of intelligent robots. Future robots will develop towards diversification, miniaturization, micro-miniaturization, practicality, and intelligence. Among these, the development of micro-robots is particularly noteworthy. With the further development of microelectronics and nanotechnology, various micro-robots have emerged. For example, George Technologies in Atlanta, USA, developed an insect-shaped robot called a "micro-aircraft." It is only 15 centimeters in size, but it can automatically fly to its target, collect visual, chemical, and biological information, and then transmit this information back to the operator. November 2000. A robot called "iRobot" has been introduced. It is the first robot that can connect to the Internet wirelessly and has the ability to hear, speak, and see. As a Sony expert aptly put it, "The 1980s were the era of PCs, the 1990s were the era of the Internet, and I believe that the next decade will be the era of robots."