"Active and passive voice difference"

Active voice

In
Active voice
the subject of sentence performing the action.
The dog bit the boy.

Passive voice

In Passive voice

the subject of the sentence does not perform the action and is therefore Passive."Grammar denoting a voice of verbs in which the subject undergoes the action of the verb(e.g. they were killed as opposed to he killed them).the opposite of active."(oxforddictionaries) Passive voice