Which generation of robots is characterized by sensors that provide information about the environment?

• A. First generation robots
• B. Second generation robots
• C. Third generation robots
• D. Autonomous robots

Answer: (C)

Environmental sensing and perception are what enable a robot to understand and react to its surroundings, not just follow a fixed program. Earlier generations moved from rigid, predefined sequences to using sensors simply to correct basic actions, but they still relied heavily on human-directed guidance and limited autonomy. When sensors are integrated with higher-level processing so the robot can interpret the environment, plan actions, and adapt to changes on its own, you’re looking at the generation where perception drives autonomous behavior. That combination—real-time environmental information feeding decision-making and autonomous action—defines third-generation robots.