The document discusses the differences between active and passive voice in writing. Active voice keeps sentences clear and concise by making the subject the performer of the action. In passive voice, the subject receives the action of the sentence. The document provides examples of active versus passive sentences and tips for converting passive sentences to active voice, such as looking for "by phrases" and moving the subject closer to the beginning. While passive voice can sometimes be used purposefully, overusing it tends to make writing wordy and unclear.