Heroku is a platform-as-a-service (PaaS) that allows developers to build, run, and operate applications entirely in the cloud. It simplifies the deployment process for various programming languages, including Python, by providing a user-friendly environment for managing applications without the need to handle server infrastructure directly. Heroku runs applications in virtual containers known as Dynos, which can be easily scaled as needed ¹².

One of the key advantages of using Heroku is its developer-centric approach, allowing developers to focus on coding while Heroku manages the underlying servers. It also offers a powerful command-line interface (CLI) for managing applications directly from the terminal ². Additionally, Heroku provides over 200 add-on services that can be integrated with applications, enhancing their functionality ².

However, it’s important to note that as of November 28, 2022, Heroku has discontinued its free tier, which included free Dynos and database services ⁴.

If you have more specific questions about Heroku or its features, feel free to ask!