Composition should be considered and used purposefully in order to enhance an image. The Rule of Thirds (ROT) is one of the more well known and utilized tools a photographer has at his& disposal as a means to enhance composition within a photograph.
This photo demonstrates the rule of thirds, when the image is cut into thirds both horizontally and vertically. Forms are then placed on the intersections, creating an interesting and balanced image.
*Rules of composition* rule of thirds Photography class
Rule of third with and without the grid
Understanding the rule of thirds in photography This is landscape rule of thirds