The “rule of thirds” is a technique or rule (although there is no such thing in photography as a hard and fast “rule”) about how to compose a picture using the elements in it. Divide the picture into nine parts of equal size using two vertical and two horizontal lines.

The four interior intersections of these lines are the main points of interests in the photo, where the eyes are naturally drawn. The photo should be composed with the understanding that these points in the middle of the picture are where people will look first. Usually that means the main items of interest should be located at or near one of those points, but sometimes an interesting photo can be constructed by having something at those points that draws the attention to another part of the photo where the main subject resides.