Pura Besakih is a really big and important temple in Bali. It's special because it's actually made up of many smaller temples that all come together to make one really big temple. It's kind of like if you had a bunch of little Lego pieces and you put them all together to make one giant Lego building.
People go to Pura Besakih to pray and show respect to their gods. They also go to celebrate important holidays and festivals. The temple is built on the side of a volcano, which means it's really high up and has a really great view of the surrounding area.
While Pura Besakih is really big, each of the smaller temples inside it serve a specific purpose. For example, one might be for praying for good health, another for praying for a good harvest, and another for praying for protection from evil spirits.
Overall, Pura Besakih is a really special and important place for the people of Bali, and it's a really cool place to visit and learn about.