Active Voice
In Active Voice the subject acts upon the object, i.e. the subject performs the action.
A sentence in Active Voice has Subject + Verb + Object.
For example, Subhendu ate an Apple.

Subject: Subhendu
Verb: Ate
Object: Apple

He bought a new car.

Mina drinks plenty of water.

Shweta knows Meenal.

Kashish wrote a letter.

Sita cleaned the room.

I gave her a beautiful dress for her birthday.