A site’s structure is an extrapolated version of this organization.

For example, I like to think of a website like a house. The ideal house has the appropriate number of rooms that are easily accessible.

In this analogy, pages are represented as rooms. To make the house livable you want to make sure that hallways. Without these hallways, you would only be able to access the rooms by the exterior windows.

Topics vs. Keywords

One of the major points in creating an ideal site structure is how you organize pages into topic silos.

While keyword research is a topic all in itself, I will say that it is important to think of your pages/page groups less from a keyword perspective and more as topics.