Balance is a compositional technique in photography that juxtaposes images within a frame so that the objects are of equal visual weight. When different parts of a photo command your attention equally, perfect balance is achieved. In photography, there are two main techniques of balance you should be aware of: formal and informal.
Formal balance can be defined as symmetrical balance.The second photo on the side is a great example of formal balance. Notice how the egg is framed in the middle of the photo with an even amount of space around all sides. The colored triangle shapes on the table top also lends itself to using this type of balance. If this photo was framed differently (using the rule of thirds), with the egg positioned on one of the left or right side of the frame, it would most likely feel unbalanced because one half of the image would be completely empty.
Informal balance is a less obvious form of balance in photography and requires more attention.Simply put, informal balance occurs when dissimilar elements balance each other out on each side of the frame. The third picture is an example of a photo using informal balance. The photographer positioned himself to place the juniper in the foreground and to the left side of the image, and the rock formation in the background and to the right side of the image. This framing effectively lends foreground interest and balance to the composition. If the juniper was left out of this photo, it might feel unbalanced to the viewer.