A pageview is an instance of a page being loaded by a browser. The Pageviews metric is the total number of pages viewed; repeated views of a single page are also counted.
Google Analytics logs a pageview each time the tracking code is executed on a web page.
Specifically, any time the tracking call is executed, the Analytics tracking code retrieves the path and page using the
window.location object and automatically logs a pageview. You can also simulate a pageview by using the _trackPageview() function in the tracking code for those situations where there is no specific URL. For more information, see _trackPageview() on Google Code.