What is the primary purpose of the mihrab in a mosque?

The primary purpose of the mihrab in a mosque is to denote the qibla, which is the direction Muslims face during prayer (salah). It is specifically a semicircular niche that is set into the wall that faces Mecca, thus guiding worshippers in the correct direction while praying. This architectural feature is not merely ornamental; it serves a functional role by emphasizing the significance of the direction of prayer and creating a sacred space within the mosque for congregational worship.

Additionally, the mihrab can also hold a deeper spiritual significance, often being beautifully adorned with intricate designs, reflecting both religious devotion and the artistic traditions of the culture in which it is located. While other options mention features that could be related to architecture or aesthetics, they do not capture the essential religious function that the mihrab serves in Islamic worship.