Yahoo!Bing Search Ad Listings Program is the paid advertising program that will help you promote your website in sponsored search results. The program allows you to select a number of keywords that you think are relevant and important for your website and decide how much you wish to pay (bid) for each visitor that visits your site through the search results of these keywords. The more money you wish to pay on a certain keyword, the higher in the search results your ad will come up.

http://advertise.bingads.microsoft.com/en-us/bing-ads-how-it-works?s_cid=en-us_smb_a_ya_advertise