•what is the importance of the city of makkah (mecca)?

Mecca is home to the Kaaba, one of Islam's holiest sites and the direction of Muslim prayer, and thus Mecca is regarded as the holiest city in Islam. Mecca was long ruled by Muhammad's descendants, the sharifs, acting either as independent rulers or as vassals to larger polities.

As the birthplace of Muhammad and the site of Muhammad's first revelation of the Quran (specifically, a cave 3 km (2 mi) from Mecca), Mecca is regarded as the holiest city in the religion of Islam and a pilgrimage to it known as the Hajj is obligatory for all able Muslims.

explain to me how I do that :> and why