Structure of Sharepoint Site and Navigation

SharePoint sites are always part of a site collection, which has a single parent or top - level site .

The top - level site can have any number of child sites, grandchildren, and so on, and each site will have one or more pages in a page library .

The site structure is therefore based on pages(the leaf nodes, which are viewable by end users) and sites (the containers, each of which has at least one default page to display).