PostgreSQL is a powerful, open-source relational database management system known for its reliability, data integrity, and support for advanced SQL features. It runs on multiple operating systems, including Ubuntu 20.04.02 LTS, making it highly accessible for developers and administrators. PostgreSQL supports a wide range of data types and provides robust tools for concurrency, indexing, and optimization. It also offers seamless scalability, allowing applications to grow efficiently. Security features such as role-based authentication and SSL encryption help ensure data protection. Additionally, PostgreSQL's rich ecosystem of extensions and active community make it a top choice for complex, high-performance applications.