Islam is derived from the Arabic root "Salema": peace, purity, submission and obedience. In the religious sense, Islam means submission to the will of God and obedience to His law. Salam may also mean greeting one another with peace.
One of the beautiful names of God is that He is the Peace. It means more than that: submission to the One God, and to live in peace with the Creator, within one's self, with other people and with the environment.
A Muslim is supposed to live in peace and harmony with all these segments; hence, a Muslim is any person anywhere in the world whose obedience, allegiance, and loyalty are to God, the Lord of the Universe.
Muslims are supposed to live in accordance with God's laws. By doing so, they strive to obtain nearness to God and victory over temporary trials and temptations in this world. All aspects of their practice including prayer, fasting, charity, and pilgrimage are intended to help meet this goal.
And so this section's aim is to help everybody meet that same goal.