The transit method is a technique used in astronomy to detect exoplanets, which are planets outside our solar system. This method involves observing the brightness of a star over time. When a planet passes in front of the star, it blocks a small portion of the star's light, causing a temporary dip in brightness. By measuring these dips, astronomers can infer the presence of a planet, its size, and its orbit. This method has been successfully employed by missions like Kepler and TESS (Transiting Exoplanet Survey Satellite). The transit method is particularly effective for finding planets that are close to their stars, making it a valuable tool in the search for potentially habitable worlds.