What's a page view?
A page view is, quite simply, a display of your ad. For example, if an ad has 1000 page views, this means that it has been displayed 1000 times. While these 1000 page views could have been viewed by 1000 different people, it's more likely that some people saw your ad more than once. To get an idea of how many unique people saw your ad, look at the unique users measurement.
From here, you may want to: