The document discusses the difference between active and passive voice. In active voice, the subject performs the action, while in passive voice the subject receives the action. Passive voice sentences tend to be more wordy and less concise than active voice. However, passive voice is preferable when the actor is unknown or unimportant, or when the focus should be on the receiver of the action. The document provides examples of changing sentences from active to passive voice and vice versa. It also lists some advantages of using active voice over passive voice.