Is MySQL free?
MySQL Community Edition is free. Enterprise Edition requires commercial license. Most use cases covered by free version.
What is MySQL?
MySQL is the world's most popular open-source relational database. Powers WordPress, many web apps, and enterprises. Now owned by Oracle.
MySQL vs PostgreSQL?
MySQL is simpler and faster for reads. PostgreSQL has more features and better SQL compliance. PostgreSQL generally preferred for new projects.
Should I use MySQL or MariaDB?
MariaDB is a MySQL fork with more features. Fully compatible. Either works, but MariaDB preferred by some for community governance.