The imam leads the people in the rak'ahs.
At Friday prayers, also called Jumu'ah, the imam preaches a sermon using words from the Qur'an. The Friday prayers are obligatory for men.
Before worship, Muslims must perform a ritual washing (wudu) to prepare for prayer:
If no water is available, clean sand may be used.
Upon entering the mosque, Muslims remove their shoes and sit on the floor facing the qiblah (prayer wall) which allows them to face Mecca during worship.
Women may attend the mosque, but they must sit separately from men.