Wizard are Istari sent over by the Valar to contest the power of Sauron, and to move Elves and Men and all living things of good will to valiant deeds. You should read the "Of the Rings of Power amd the Third Age/Silmarillion", and "The Istari/Unfinnished Tales". Their are also some threads on this subject in this forum, that might help you out.
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