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.
\[\begin{array}{rl} \bullet & \text{Origin and Purpose: Stupas originated as pre-Buddhist burial mounds. In Buddhism, they are primarily built to enshrine the sacred relics of the Buddha, his disciples, or other venerable figures. After the Buddha's Parinirvana (death), his cremated remains were divided and buried under several stupas.} \\ \bullet & \text{Symbolism: A stupa is a highly symbolic monument. It represents the enlightened mind of the Buddha, the path to enlightenment, and the universe itself.} \\ \end{array}\]
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.