Exoplanet systems are groups of planets that orbit stars outside our solar system. These planets, known as exoplanets, can vary widely in size, composition, and distance from their host stars. Some exoplanets are similar to Earth, while others are gas giants like Jupiter or Neptune. Scientists study these systems to understand the diversity of planetary environments in the universe. The discovery of exoplanet systems has been made possible through advanced telescopes and detection methods, such as the transit method and radial velocity method. By analyzing the light from stars, researchers can identify the presence of exoplanets and gather information about their atmospheres and potential habitability.