Exoplanets have transformed our understanding of the universe. They have shown us that there are many planetary systems that are very different from our own Solar System. Exoplanets can be gas giants like Jupiter or rocky like Earth, and they can have extreme environments like scorching temperatures, high radiation, and even diamond rain. The discovery of exoplanets also raises questions about the possibility of life beyond Earth, and studying the habitability of exoplanets is an exciting area of research.