What is a robot? Mention four areas where robots can replace humans that are not mentioned in this unit.

A robot is a machine programmed to perform tasks autonomously or semi-autonomously, often using AI and automation. Robots enhance efficiency and safety in various industries. Apart from common applications, robots can replace humans in hazardous environments such as deep-sea exploration, where they conduct underwater research. They can assist in mining operations, reducing human exposure to dangerous conditions. In space exploration, robots perform tasks on other planets without risking human lives. Additionally, robots can work in disaster response, searching for survivors in collapsed buildings or hazardous areas. These applications highlight their potential to enhance safety and efficiency in challenging environments.