A feature of sentence in which the subject performs the action of the verb and the direct object is the goal or the recipient. This is what active voice.

a feature of sentence in which the object or goal of the action functions as the sentence
subject and the main verb phrase includes the verb to be and the past participle.
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VOICE means transforming of a verb to another verb without changing its original meaning.
Voice is of two types:
1)Active voice
2)Passive voice
ACTIVE:here,subject is the doer of the action denoted by verb.
PASSIVE:here,subject is not active,but subject is being acted upon by verb.
eg;Active:John writes a letter.
     Passive:A letter is written by John.
this is about active and passive voices...
Let me ask u question:
John eats an apple.TURN it into passive voice...