Design is primarily about presenting information according to its relevance. A footer is a way of presenting unlikely-to-be-relevant-but-still-necessary informa

Design is primarily about presenting information according to its relevance. A footer is a way of presenting unlikely-to-be-relevant-but-still-necessary information. It is a tool that accomplishes something that is necessary for just about every webpage. "Footers" (or related things like captions) exist in just about every design, and they almost always function the same. Art galleries have plaques. Books have footnotes. Food packaging has nutritional info. If your design doesn't have a footer, then it's probably a mistake.