A stupa is a dome-shaped structure that serves as a Buddhist monument, often containing relics or sacred objects. Traditionally, stupas are built to commemorate the Buddha or important events in his life. They are designed to symbolize the universe and are often adorned with intricate carvings and symbols. Stupas can be found in various forms across Asia, with notable examples in countries like India, Nepal, and Thailand. They are typically surrounded by a walkway for circumambulation, allowing devotees to walk around the stupa as a form of meditation and respect.