Ad position is the position of your ad on a Bing, AOL, or Yahoo search results page. It's determined by how your ad ranks against competing ads. Ad rank is determined by many factors, including:
Since webpages have a limited number of spaces to show ads, we auction those spaces. You are bidding against other advertisers to get your ads in those spaces. So, if you sell shoes and bid on the keyword "shoe," you’ll have to beat the bids of the other shoe sellers who are also bidding on "shoe." If your bid is not high enough, you might not get the space you want, such as on the first page of search results.
This data shows which keywords cause your ads to appear in the mainline (top) or sidebar or bottom of the page (other) position on search result pages. For example, to appear at the top of the ad results on Bing.com in position 1,2,3, or 4, (also called the mainline), your ad must meet a minimum level of performance. If the ad doesn’t meet that minimum level, it can appear on the right side of the page (also called the sidebar) or at the bottom of the page. There’s nothing wrong with appearing on the sidebar or at the bottom of the page, but most advertisers strive to get one of those coveted mainline spots. (In some markets, the top ads are repeated at the bottom of the web page at no additional cost). For suggestions on how to improve your ad position, see Get my ad to the top of the search results page.
You can run an account, campaign, ad group, ad, or keyword performance report and select the Top vs. other column to see performance differences (such as CPC and CTR) between mainline and sidebar ads. This can help you optimize your keyword bids to improve performance and increase your ROI. Please note that when reviewing the Top vs. other column in Reports, sidebar ads and ads at the bottom of the page are both listed as “other” ads. For info on running a performance report, see Create a report.