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MySQL
MySQL is a popular open-source relational database management system (RDBMS) known for its reliability, performance, and ease of use. It’s widely used in web applications to store and manage structured data, often paired with PHP and Apache/Nginx in the LAMP/LEMP stack. MySQL supports standard SQL, ACID-compliant transactions, and features like replication, partitioning, and clustering. It's commonly used for everything from small websites to large-scale enterprise applications.