Definition
shows the relationship between the action, event or condition and the subject or the people affected by it
includes the following
active voice - the person or thing that performed the action is the subject of the verb
(A does B) (I wrote this page)
passive voice - occurs in most aspect and tense and changes the emphasis
to form the passive voice use "to be" with the past participle. (B is done by A) (This page was written by me.)
the subject and the direct object switch places. The direct object ("this page") becomes the subject in the passive sentence
Examples
active - I wrote this page.
passive - This page was written by me.