The header is one of the most visible sections on a website and it is the place where a lot of effort is concentrated in order to improve usability and accessibility. The footer is its natural counterpart that encloses the body of the site from the bottom. It can contain copyright information, privacy policy, terms and conditions, information for advertisers, investors and others. The footer is probably the most rarely seen section of the site, especially when the page length exceeds the visible screen space. But because of its enclosing role, it still affects the overall appearance of the site, which is even more apparent in the presence of the header. A well-crafted footer can make the site appear more credible and trustworthy and thus enhance the design.

Since the footer is the last visible thing on the site, we can expect that people prepare to leave. We can think of it in this way: "What is the last thing we would like to say to a guest visitor before he/she leaves?" Not all designs can give a satisfactory answer here. If well-designed, this last thing can leave a lasting impression. This is the reason why some designers try to provoke a smile at the end—through a small cheerful illustration or something else—to uplift the mood of the user in a memorable way.