There are Five Pillars of Islam.. Pillars of Islam is a things which every Individual Muslim should follow.. They Are:..
1.Every Muslim should Believe that there is only one God and Muhammed(SAW) is the Messenger of the God..
2.Should perform Five times Salah in a Day..
3.Should give Charity for a Poor (2.5% of his wealth only under some Conditions)
4.Should perform Fast in the month of Ramzan (9th month of Islamic Calender) Not for sick persons n travellers
5.Should Pilgrimage to Makkah (only who have Health and Wealth)
If a person deny any of above Aspect, he/she is not considered as a Muslim.. Hence, it's called Basic Pillars Of Islam..