Stellarium is a free, open-source planetarium software that allows users to explore the night sky in a realistic way. It provides a detailed, interactive 3D simulation of celestial objects, including stars, planets, and constellations. Users can customize their viewing experience by adjusting the time and location, making it suitable for both amateur astronomers and educators. The software features a user-friendly interface and is available on multiple platforms, including Windows, macOS, and Linux. Stellarium also includes information about various celestial events, such as meteor showers and eclipses, enhancing the learning experience for anyone interested in astronomy.