A mosque (/ mɒsk / MOSK), also called a masjid (/ ˈmæsdʒɪd, ˈmʌs -/ MASS-jid, MUSS-), [ note 1 ] is a place of worship for Muslims. 1 The term usually refers to a covered building, but can be any place where Islamic prayers are performed, such as an outdoor courtyard. 2 3.