Line- a mark made by a pointed tool- brush, pencil, stick, pen, etc.- and is often defined as a moving dot. It has length and width, but its width is very tiny compared to its length. A line is created by the movement of a tool and pigment, and often suggests movement in a drawing or painting.
I chose these three pictures to represent line because they show how different lines in photography can show and dramatize different aspects of the picture that you might not have noticed before.