This document discusses Heroku, a platform as a service that allows developers to build, run, and scale applications. It provides concise hosting of applications without the need to provision or manage servers. The document outlines key Heroku features like dynos for running applications, PostgreSQL databases, and add-ons; when Heroku is suitable compared to Force.com; integration of applications with Salesforce using Heroku Connect; and the developer experience on Heroku including metrics and the Heroku button.