PostgreSQL is a powerful open-source relational database management system that can be used on Debian and AWS. It is known for its reliability, scalability, and extensibility, making it a popular choice for enterprise-level applications. With its advanced features and robust architecture, PostgreSQL can handle complex workloads and large amounts of data with ease. Whether you are running it on-premises or in the cloud, PostgreSQL provides a flexible and cost-effective solution for your data management needs.