Bluemix is IBM's cloud platform that allows developers to build, deploy, and manage applications. It provides flexible compute options including containers, virtual machines, and Cloud Foundry applications. Bluemix is underpinned by open technologies like Cloud Foundry, Docker, and OpenStack. It offers deployment options in IBM's public cloud, in private dedicated environments, and locally on-premises. Bluemix provides a catalog of services, robust DevOps tooling, integration capabilities, and runtimes to build and extend applications.