What is PostgreSQL and what are its key features?

PostgreSQL is an open-source, object-relational database management system (ORDBMS) known for its reliability, feature robustness, and performance.

Key Features:
• ACID compliance for data integrity
• Support for advanced data types (JSON, XML, arrays)
• Extensibility with custom functions and data types
• Multi-version concurrency control (MVCC)
• Full-text search capabilities
• Partitioning and inheritance
• Point-in-time recovery
• Streaming replication
• Cross-platform compatibility