This document discusses different types of Salesforce demo environments that can be used for various purposes like opportunities, learning, development, and showcasing. It describes the key environments like Partner Developer Edition (PDE), Simple Demo Org (SDO), and Integrated Demo Org (IDO) and compares their features such as expiration dates, included licenses, and suitability for different use cases. The document recommends choosing the PDE for most opportunities as it never expires and fully supports environment hub and Trialforce. It also provides guidance on how and when to request access to demo environments like the SDO.