Camunda BPM is an open source workflow and decision automation platform that allows developers to embed a process engine into Java applications to enable automation of business processes and decisions. The process engine can run processes defined in BPMN format and can be started, deployed, and have process instances started. It also integrates with frameworks like Spring and Java EE and supports REST APIs, PHP SDK, and event streaming for process histories. Camunda provides tools like the cockpit for monitoring processes and the tasklist for building task forms.