Define Session, Users And Pageviews.?

A user (once known as a unique visitor) is a distinct person, or, more accurately, a distinct client ID identified in the Google Analytics tracking cookie. Users represent individuals that visit your site
A session (once known as a visit) is the browsing period of a user. Sessions represent a single visit to your website.
A pageview is very simply the act of loading a page. Pageviews represent each individual time a page on your website is loaded by a User.

Sessions represent a single visit to your website. Whether a User lands on one of your web pages and leaves a few seconds later, or spends an hour reading every blog post on your site, it still counts as a single Session. ... Pageviews represent each individual time a page on your website is loaded by a User.

A pageview is defined as a view of a page on your site that is being tracked by the Analytics tracking code. If a user clicks reload after reaching the page, this is counted as an additional pageview. If a user navigates to a different page and then returns to the original page, a second pageview is recorded as well.

A session is a group of user interactions with your website that take place within a given time frame. For example a single session can contain multiple page views, events, social interactions, and ecommerce transactions. ... A single user can open multiple sessions.

A user (once known as a unique visitor) is a distinct person, or, more accurately, a distinct clientID identified in the Google Analytics tracking cookie. As long as a person comes back on the same browser and device and doesn't clear cookies, Google Analytics will be able to identify that person as the same user