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Supabase is an open-source alternative to Google's Firebase, providing a complete backend-as-a-service for developers. It is built on top of PostgreSQL, the world's most trusted relational database, giving you the scalability of SQL with the ease of use of a no-code tool. Its suite includes Database, Authentication, Realtime subscriptions, and Edge Functions. A unique feature is its "Row Level Security" (RLS), which allows you to define complex access policies directly in the database layer, ensuring that users can only access their own data. Because it is open-source, you avoid the dreaded "vendor lock-in" associated with proprietary cloud platforms. For startups and scaling agencies, Supabase provides the infrastructure to build enterprise-grade applications in a weekend, handling all the complex plumbing of user management and data storage out of the box.