Camera Focus on Object

I have an object which is moving around on the plane, I want that, if object move in some direction, camera also move with object. Please guide me how can I do this.

Sorry for my bad english

The easiest way would probably be to make the camera a child of the object. If you move the object, the camera will move along.

If it's enough to only "focus" on the object as in 'looking at the object', try to use Transform.LookAt

If i understand your ? right then you can use "Smooth follow" to make the camera follow a object when it moves.

Just search "Smooth follow" in the search bar in unity 3D and select "Smooth follow" and attatch it to the camera, and set the target to the object you want the camera to follow. Then when the object moves the camera konstantly looks at it.