Full context:   The ritual obligations of Muslims are called the Five Pillars. They are acknowledged and practiced by Muslims throughout the world, notwithstanding their disparities. They are viewed as compulsory for individuals who genuinely wish to pursue a life like that which Islamic prophet Muhammad led. Like other religions, Islam holds certain practices to be standard; however, that does not imply that all individuals who regard themselves as Muslims necessarily observe them. Individual participation can vary depending on the individual's faith; for example, not every individual prays every day, keeps the fast, performs the Hajj, or donates extensively to charity. There are also Muslim communities such as Alevis who reject the Five Pillars but follows Four Doors system.