A page impression is basically a single request to load a web page, so a "session" would be whether a person visited the site, not how many pages they viewed. An impression goes by each time the page is refreshed and a new page is loaded.
So impressions might not be multiple people., but the same person viewing the same page again and again.
Page impression is noting but if a person searches for a keyword and there is a list of websites along with, which your website is also present then it is called impression, if that person clicks on your site then it is click.
The exact number of times a specific Web site has been accessed or viewed by a user. A page impression acts as a counter for Web pages, informing site owners how many times their sites were visited. Page impressions are also referred to as hits
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