Ad space - The area of a web site designated to carry banner ads

Ad space - The area of a web site designated to carry banner ads. The space could be filled with banners designated by the publisher of the site, or the space could display ads hosted on a third-party ad server. Banner sizes are one of the few things that are standard throughout web site design and publishing - probably because they are the only source of income for many web sites. Convention also dictates where on the web page banners are hosted - normally across the top, down the right-hand side and along the bottom.