PostgreSQL (often called Postgres) is a powerful, open-source relational database management system that CanuckDUCK uses to store and organize its data. Like a highly sophisticated digital filing system, PostgreSQL stores user accounts, glossary terms, forum posts, and other platform information in structured tables that can be efficiently searched and updated. PostgreSQL is known for reliability, data integrity, and ability to handle complex queries. It's widely used by organizations worldwide, from small websites to large enterprises like Apple and Instagram. Being open-source means it's free to use and continuously improved by a global community of developers.