What are PAGEVIEWS?
A pageview is an instance of a webpage being loaded by a browser.
How are PAGEVIEWS different from impressions?
In some cases, a page will load but an ad is not served in the ad place on the page. When this happens, a pageview is counted, but not an impression.
Why is monitoring PAGEVIEWS useful?
For publishers, monitoring pageviews can be useful for tracking the activities of visitors to your site. Pageviews will tell you which pages are most popular and least popular. Knowing this can help you better optimize your page.