The total number of times your pages were loaded by your visitors.Bounce Rate The percentage of visitors with a single page view. A visitor “bounces” away and leaves your site after only viewing a single page.
How long time visitors spend on your site. It only shows people who visit more than one page. For those who visit one page only we default to 0 seconds. Average visit duration is the sum of all session lengths divided by the number of sessions, which includes the 0 second visits (bounces).
Session is a set of actions that a user takes on your site. A session is started when a visitor first lands on your page and ended when no action is taken on your site for 30 minutes.
How many people are currently on your site. This includes all visitors who have loaded a page in the last 5 minutes.