Earth-like planets are planets that share similar characteristics with Earth, such as a rocky surface, presence of liquid water, and a suitable atmosphere for life to exist. Researchers study these planets to understand their potential habitability and the possibility of supporting life forms similar to those found on Earth. The search for Earth-like planets is important in the field of astrobiology, as it could provide insights into the existence of extraterrestrial life beyond our solar system. Scientists use various techniques, such as telescopes and space missions, to identify and study these planets in distant star systems.