This document discusses how to deploy a Phalcon application on Heroku, a platform as a service that allows developers to deploy applications via Git push. It provides instructions for using a custom buildpack to deploy a Phalcon skeleton application to Heroku, including cloning the skeleton repository, adding required files, and pushing to Heroku. Alternative deployment methods like customizing the buildpack, using multi-buildpacks, or deploying via Docker are also mentioned.