Whats the difference between active and passive?

examples needed

When using active voice, the subject performs the action noted by the main verb. (As one site put it, the subject is a do-er or a be-er.)

When using the passive voice, the subject is acted upon by another agent or an unknown something. (The subjects of passive sentences are not do-ers or be-ers.)

These are much better explained with examples:

Active: Brutus stabbed Caesar.

Passive: Caesar was stabbed by Brutus.

Active: The committee approved the new policy.

Passive: The policy was approved of by the committee.