Arabic term appearing 41 times in the Quran and can translate as effort and struggle. But from here arise interpretations and disagreements between Islamic groups. Let us remember that Islam as all religions have a separator between Sunni and Shi'a schism, schism that you emerged a few years died the Prophet. For some, this effort is the self-reliance of living according to the law divine, including others, the obligation to expand the Islamic religion as the only true. Others regard it as the holy war in which there is no tolerance with unbelievers, i.e. non-Muslims, so that those who do not want to become don't deserve to live. These are fundamentalists, fundamentalists and fanatics of the Muslim religion, which we have quite a few negative experiences in the West.
