A Site, an Academic Department, and an Academic Program are all top-level container content types. Each one serves as the landing page and home base for a section of ithaca.edu, with the rest of that section's content nested underneath it. They are built and edited the same way, and all three are created by the Web Team. The only meaningful differences are what each one represents, who can edit it, and which content types can live beneath it.
Because they work almost identically, this page covers all three together. The shared behavior is described first, and the differences are listed at the end.
How these content types work
Each of these content types sits at the top of its own section. Other content, such as Pages, Topics, and Media Galleries, is created underneath it and inherits the section's navigation and shared elements. You set those shared elements once, on the Site, Department, or Program itself, and they carry down to every page beneath it.