Five Pillars of Islam

1. Shahada (Shahaadah) (testimony of faith)
The testimony of faith is the most important pillar of Islam. To perform the testimony of faith, one is required to say with conviction at least once in his or her life: "There is no god but Allah, and Muhammad is the messenger of Allah." In order to convert to Islam, one must utter the shahaadah with complete conviction.

2. Salat (prayer)
Muslims pray five times daily, at dawn, noon, mid-afternoon, sunset and night. Prayer often occurs in a mosque, but Muslims may pray anywhere: inside or outside, in their office, home, school or elsewhere. While praying, one faces Mecca and strives to recite his or her prayers from memory. Ideally, saalat are recited in Arabic.

3. Zakat (almsgiving)
Charitable giving, or Zakat, is a requirement of faith for all Muslims. Used to benefit the poor, Zakat represents a fixed portion of one's wealth and assets. Beyond this requirement, one may also perform an act of charity (sadaqah) by donating additional funds to the needy.

4.  Siyam (Sawm) (fasting)
Sawm literally means any ritual fasting, but is generally understood to refer to ritual fasting during the month of Ramadan. From dawn to dusk for the entire month, Muslims must refrain from eating, drinking and engaging in sexual relations. Through this physical abstinence, Muslims are able to focus intently on their spiritual selves, atoning for their sins and recommitting to serving Allah.

5. Hajj (pilgrimage)
During the last month of the Islamic calendar, Dhu al-Hijjah, some two million Muslims ascend to the holy city of Mecca for the Hajj, or pilgrimage. Every able-bodied Muslim is required - if their finances permit - to make the pilgrimage at least once in their lifetime. If performing the hajj will put an undue burden on one's family, he or she may appoint a proxy to fulfill this duty in his or her place.  Islamic teachers are careful to warm, however, that the Hajj must be performed as an expression of devout faith - and not as a ploy to gain social status.