The Five Pillars of Islam are the fundamental acts of worship and practice that are considered obligatory for all Muslims. They are:

1. Shahada: The declaration of faith, affirming the belief that there is no god but Allah, and Muhammad is His messenger.
2. Salat: The performance of ritual prayers five times a day facing the Kaaba in Mecca.
3. Zakat: The giving of alms or charity to support those in need, typically calculated as a percentage of one's wealth.
4. Sawm: Fasting during the month of Ramadan from dawn until sunset, refraining from food, drink, and other physical needs.
5. Hajj: The pilgrimage to the holy city of Mecca that Muslims are required to undertake at least once in their lifetime if they are physically and financially able.