Ad Rank is the display position of your ad. It’s a value that's used to determine your ad position (where ads are shown on a page relative to other ads) and whether your ads will show at all.
Getting top Ad rank will let your ads get the most click-through rates and get the most and the first attention and it generally has the highest conversions.
Ad Rank is calculated using your bid amount and your quality score. Also, ad positioning can change depending on the following factors:
- Competition
- Search relevance
- Expected impacts - These include their expected click-through rate their expected ad extensions, and how those ad extensions may or may not affect the ad ranking.