We think of a "Project" as a folder and the "Biolink" as a file inside the folder.
When you create biolink pages or shortened links, you could place them inside a project to better organize them and track stats.
Here is an example of a two projects with multiple biolinks inside them.
As you can see, the total number of links and clicks is shown for each project. This total reflects the sum of all projects and links inside that particular project.