Planet occurrence is a research area within astronomy that focuses on studying the frequency and distribution of planets in the universe. This field encompasses the study of exoplanets, which are planets that orbit stars outside of our solar system. Scientists in this area use a variety of methods, such as transit observations and radial velocity measurements, to detect and characterize exoplanets. By studying planet occurrence, researchers aim to better understand the formation and evolution of planetary systems, as well as the likelihood of finding habitable planets in our galaxy.