How a Session measure in Google Analytics? & how it count Time for each session.

Hey can anybody tell me. What are the differences among- Session, Users & Page views? In count of session what is the role of time & how it will be count? Please Give an answer with simple example

Page views - any page views, even duplicates
Users - only unique visitors
Sessions - sessions, the name says it. When a visitor visits your site, and opens other pages, it counts them as 1. When he closes your site and opens it after 2 hours again, it will count as 1 more, but any other page he views in the same session won't count.

Or, straight explanation by Google:
Session - Total number of Sessions within the date range. A session is the period time a user is actively engaged with your website, app, etc. All usage data (Screen Views, Events, Ecommerce, etc.) is associated with a session.

Users - Users that have had at least one session within the selected date range. Includes both new and returning users.

Pageviews - Pageviews is the total number of pages viewed. Repeated views of a single page are counted.