March stats report and a breakdown of what each report means.
A 'Session' is defined as a series of clicks on your site by an individual visitor during a specific period of time. A Session is initiated when the visitor arrives at your site, and it ends when the browser is closed or there is a period of inactivity.
A 'Hit' is simply a successful request to your web server from a visitor's browser for any type of file, whether an image, HTML page, an MP3 file, or any other type. A single web page can cause many Hits -- one for each image included on the page, etc.
* Session: A series of Hits to your site over a specific period of time by one visitor.
* Hit: Any successful request to a webserver from a visitor's browser.
* Bytes: The quantity of network bandwidth used by the files requested during the selected Date Range.