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if you need banner ads for your home page, to get other people to display on their sites, then you just need to make a graphic of the correct size, using one of the templates given in the previous answer. if you need banner ads for your own webpage, the best and probably most well known source is Google Adsense. Google can supply contaxt sensitive banners, and other format, adverts that are inserted in your pages and you get paid for click throughs. see these links and follow from there