A Footer usually contains links and is at the end of every page.

Footer that contains a "Text Footer" element and the "Social Media Icons" element

Activate Footers in "Lay Options" → "Footers". A page can be a footer for projects, pages and categories. You can choose one footer for all projects for example. Or you can activate "Show a select input in the Project Edit Screen to choose a Footer for individual Projects".

Lay Options → Footers