Can you list the key features and advantages of PostgreSQL?

PostgreSQL is a powerful open-source object-relational database management system. Key features and advantages:

• SQL standards support and extended capabilities, including complex queries, transactions, subqueries.
• Extensibility: you can create your own data types, functions, operators.
• Reliability and consistency thanks to support for ACID transactions.
• Multiversion Concurrency Control (MVCC) for high performance in concurrent access.
• Support for JSON and JSONB for working with unstructured data.
• Replication and scalability: support for streaming replication, logical replication.
• Active community and extensive documentation.

These features make PostgreSQL a popular choice for a variety of applications — from small projects to large corporate systems.