Final answer:
The Hijrah was Muhammad's journey from Mecca to Medina/Yathrib in 622 CE, marking the start of the Islamic calendar.
Step-by-step explanation:
The Hijrah was Muhammad's journey from Mecca to Medina/Yathrib. It took place in the year 622 CE. The journey marked the beginning of the Islamic calendar and had significant historical and religious implications for Islam.
Learn more about Hijrah in Islamic history