Tawhid is the Muslim belief that Allah has no equal, so to worship anyone or anything else is considered shirk. Muslims may love and respect the Prophet Muhammad, the messenger of Allah, but they do not worship him as he is not divine and not equal to Allah.
Before worshipping Allah, Muslims perform ritual washing called wudu, to prepare for prayer.
Together they complete several rak'ahs of Salah, which involve recitations from the Qur'an and a series of bodily movements including prostration, with forehead, hands, knees and feet touching the floor. Afterwards personal prayers called du'a may be said.
Women may attend the mosque but sit separately from men.
Mosaics with complicated patterns decorate many mosques, but there are no images of Allah, Muhammad or any other human or animal figures. Allah is considered to be beyond human understanding and therefore cannot be portrayed. Pictures or statues of other human figures are avoided because they could mistakenly be worshipped, which would be idolotry or shirk, which is one of the gravest sins in Islam.
Instead, calligraphy is often used to decorate the walls of the mosque with important passages from the Qur'an.