The document discusses Heroku, a platform for deploying and hosting web applications. It notes that Heroku is a polyglot platform that allows developers to build apps using any programming language. The document highlights features like continuous deployment with zero downtime and being scalable. Charts show the large growth in the number of apps hosted on Heroku over time. It also provides examples of popular apps built on Heroku and describes how apps are packaged and run as "slugs" and "dynos" on the platform.