Heroku is a PaaS (Platform as a Service) that allows to build and run web apps, jobs and APIs in 8 languages, while the platform takes care of things like routing, erosion or failures for you. When using Heroku, you can utilize add-ons that will make your life easier, to create and use databases, handle deployments, manage logging etc., among other features, making the tasks of building, deploying and running apps a much pleasant experience.