What is a stupa?

A stupa is a dome-shaped structure that originated in ancient India, primarily used to house relics of Buddha or other important religious figures. It is an important Buddhist architectural form, symbolizing the path to enlightenment. The stupa often has a central chamber containing relics, surrounded by a mound of earth or stone. Pilgrims would visit stupas to meditate and pay respects. Some stupas, like the famous Sanchi Stupa, are adorned with intricate carvings and inscriptions depicting scenes from the life of the Buddha. Stupas continue to be significant in Buddhist tradition and architecture.

This question related to Chapter 5 Social Science Class 6th NCERT.
From the Chapter 5. India, That Is Bharat.
Give answer according to your understanding.