Kaltura is an open source video platform that allows users to manage, create, edit, share, and publish videos online or via their own server. It offers both SaaS and self-hosted options. The platform aims to become the largest video network online and supports users, advertisers, media companies, social networks, educators, and integrators. It currently supports over 38,000 websites and provides tools like video editing, publishing, widgets, and APIs for developers to build integrations.