Heroku is a cloud platform that allows developers to build, run, and operate applications entirely in the cloud. It supports several programming languages, making it versatile for various projects. Developers can easily deploy their applications without worrying about the underlying infrastructure, as Heroku manages servers, storage, and networking. One of the key features of Heroku is its simplicity and ease of use. It provides a user-friendly interface and tools that help developers scale their applications quickly. Additionally, Heroku offers a marketplace with add-ons for databases, caching, and monitoring, enhancing the functionality of applications hosted on the platform.