A mosque — masjid in Arabic, meaning "place of prostration" — is where Muslims gather to pray. Beyond prayer, mosques serve as centers of community life: places of learning, charity, and gathering.567
Houses built for God's remembrance
The Quran describes mosques as places raised up for the worship and remembrance of God:
"[Such niches are] in mosques which Allah has ordered to be raised and that His name be mentioned therein."
— Quran 24:36 (Saheeh International)2
It also describes who keeps them alive — those of sincere faith:
"The mosques of Allah are only to be maintained by those who believe in Allah and the Last Day and establish prayer and give zakat and do not fear except Allah."
— Quran 9:18 (Saheeh International)1
And it warns against those who would prevent God's name from being remembered in them:
"And who is more unjust than one who prevents the name of Allah from being mentioned in His mosques?"
— Quran 2:114 (Saheeh International)3
The three holiest mosques
Islam holds three mosques in special honor — so much so that the Prophet ﷺ singled them out as places worth undertaking a journey to visit:
"Do not set out on a journey except for three mosques: Al-Masjid al-Haram, the Mosque of the Messenger ﷺ, and the Mosque of Al-Aqsa."
— Sahih al-Bukhari 11894
These are Al-Masjid al-Haram in Mecca (which surrounds the Kaaba and is the focus of the Hajj), the Prophet's Mosque (Al-Masjid an-Nabawi) in Medina, and Al-Aqsa Mosque in Jerusalem.
A center of community
From the time of the Prophet ﷺ, the mosque has been more than a building for ritual: it is where the community prays together, learns, organizes charity, and gathers for the major festivals. Anyone may enter to pray, regardless of background.
In short
The mosque is the house of worship and the heart of community life in Islam — a place raised for the remembrance of God, open to all worshippers, with the mosques of Mecca, Medina, and Jerusalem held most sacred of all.