Banner ads are advertisements that many web-sites use to flash their visitors with. These are small images that are placed at top/bottom/middle of web-pages. Usually they come annoying to visitors, but it is these advertisements that act as source for funds for many free sites.

Banner ads can be useful though, you come to know about new sites, new products from the banner ads, and that was one of the reasons to How I came to know about Everything2.

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