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"Voice is the quality of a verb that indicates whether its subject acts (Active Voice) or is acted upon (Passive Voice)."
Active voice defines that the subject is doing the action and the Passive voice refers to that the subject is being acted upon.
Forming passive voice requires the verb to be and a past participle.
Using the passive voice where the active would be more effective.
Unnecessary use of the passive voice can lead to awkward phrasing.