Step 1: Understanding the Concept:
The question asks for the definition and significance of a Stupa.
Step 2: Detailed Explanation:
A Stupa (from Sanskrit, meaning 'heap' or 'mound') is a dome-shaped or mound-like structure that serves as a Buddhist shrine.
The Great Stupa at Sanchi, originally commissioned by Emperor Ashoka, is one of the most famous examples.
Step 3: Final Answer:
A Stupa is a dome-shaped Buddhist monument, used as a place of meditation and to house the sacred relics of the Buddha or other holy persons.