Although Muslims can pray to God at any time, there are five prayers they are obligated to perform throughout the day. They follow the same pattern so everyone can follow in congregation, and set prayers are always recited in Arabic.
Takbir is entering into the state of prayer by glorifying God. Muslims face towards Makkah and make the intention to pray. To begin the act of prayer, they say 'Allahu Akbar' meaning God is great, raising the hands to the ears or shoulder.