What is SAP Documentum?

Can you tell me more about SAP Documentum? I'm curious to know what it is and what its primary functions are. I understand it's some kind of enterprise content management system, but I'd like a more detailed explanation. Is it a cloud-based solution? What types of documents can it handle? And how does it help businesses manage their content more efficiently? I'm interested in learning more about how it can benefit organizations in terms of collaboration, security, and compliance.