alat al-Jamaat at means praying in congregation, with one person leading. The Person who leads is called the Imam, while those who follow him are called the Ma'mum or Ma'mumin (plural). As for the daily prayers, the minimum amount of people needed is two -one, Imam and one Ma'mum. For the Salat al-Jumu'ah (Friday) there must be a minimum of five people, including the Imam.