the.com/footer

means The strip of text and links sitting at the bottom of a webpage, usually holding copyright notices, contact info, and site map links.

from Simply 'foot' (the bottom of something, a sense stretching back to Old English 'fot,' meaning the lowest part) plus the agentive '-er.' The same logic that gives us the foot of a page, a bed, or a mountain — the base, the end, the part you reach last. 'Footer' as the bottom-of-document element shows up in print and typesetting long before the web, then got borrowed wholesale into HTML, where it now dutifully holds the stuff everyone scrolls past.