This document discusses the difference between active and passive voice in sentences. Active voice has the subject performing the action of the verb, while passive voice has the subject receiving the action of the verb. Active voice is generally clearer and easier to understand than passive voice. However, passive voice can be used when the receiver of the action is more important than the subject, when minimizing the role of the subject, or when writing about scientific or natural processes. Knowing the difference between active and passive voice helps writers determine the best structure to use.