Imagine that your screen is split into nine equal squares...
When the lines meet it's called a Hotspot or a Power Point. The rule of thirds is applied by aligning a subject with the guide lines and their intersection points, placing the horizon on the top or bottom line, or allowing linear features in the image to flow from section to section.
Why Do We Use The Rule Of Thirds?
We use the Rule Of Thirds so that the image or the thing we are focusing on is not right in the middle.