A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic Abrahamic religion based on the Qur'an—which Muslims consider the verbatim word of God as revealed to prophet Muhammad—and, with lesser authority than the Qur'an, the teachings and practices of Muhammad as recorded in traditional accounts, called hadith. "Muslim" is an Arabic word meaning "one who submits to God".
Muslims believe that God is eternal, transcendent, absolutely one (the doctrine of tawhid, or strict or simple monotheism), and incomparable; that he is self-sustaining, who begets not nor was begotten. Muslim beliefs regarding God are summed up in chapter 112 of the Qur'an, al-Ikhlas, "the chapter of purity". Muslims also believe that Islam is the complete and universal version of a primordial faith that was revealed at many times and places before, including through the prophets Abraham, Moses and Jesus. Muslims maintain that previous messages and revelations have been partially changed or corrupted over time, but consider the Qur'an to be both unaltered and the final revelation from God—Final Testament.
Prayer is an invocation or act that seeks to activate a rapport with a deity, an object of worship, or a spiritual entity through deliberate communication. Prayer can be a form of religious practice, may be either individual or communal and take place in public or in private. It may involve the use of words or song. When language is used, prayer may take the form of a hymn, incantation, formal creed, or a spontaneous utterance in the praying person. There are different forms of prayer such as petitionary prayer, prayers of supplication, thanksgiving, and worship/praise. Prayer may be directed towards a deity, spirit, deceased person, or lofty idea, for the purpose of worshipping, requesting guidance, requesting assistance, confessing sins or to express one's thoughts and emotions. Thus, people pray for many reasons such as personal benefit or for the sake of others. Yoga is also a common form of prayer.
Most major religions involve prayer in one way or another. Some ritualize the act of prayer, requiring a strict sequence of actions or placing a restriction on who is permitted to pray, while others teach that prayer may be practiced spontaneously by anyone at any time.
Scientific studies regarding the use of prayer have mostly concentrated on its effect on the healing of sick or injured people. Meta-studies of the studies in this field have been performed showing evidence only for no effect or a potentially small effect. For instance, a 2006 meta analysis on 14 studies concluded that there is "no discernable effect" while a 2007 systemic review of intercessory prayer reported inconclusive results, noting that 7 of 17 studies had "small, but significant, effect sizes" but the review noted that the most methodologically rigorous studies failed to produce significant findings. The efficacy of petition in prayer for physical healing to a deity has been evaluated in numerous other studies, with contradictory results. There has been some criticism of the way the studies were conducted.