All praise be to Allah Alone, and peace and blessings be upon His Messenger, and his family and Companions.
Allah (Glorified and Exalted be He) created all creatures to worship Him Alone, with no partner or associate. He revealed His Books and sent His Messengers to order this and call to people to it.
And I (Allâh) created not the jinn and mankind except that they should worship Me (Alone).
O mankind! Worship your Lord (Allâh), Who created you and those who were before you so that you may become AlMuttaqûn (the pious See V.2:2).
'Ibadah (worship) is submission to Allah and humility before His Greatness, by carrying out His Commands and avoiding His Prohibitions, out of having Iman (Faith) in Him (may He be Praised) and His Messengers, sincerity to Him in all deeds, and belief in everything that He and His Messenger, Muhammad (peace be upon him), informed us of.
That is because Allâh — He is the Truth (the only True God of all that exists, Who has no partners or rivals with Him), and what they (the polytheists) invoke besides Him, it is Bâtil (falsehood). (Surah AlHajj)