A relational database management system (RDBMS) is a tool for managing databases that use the relational model of data storage in which structured data is stored in tables consisting of rows and columns.
Relational databases come with a number of advantages:
Ability to quickly access specific data via fast SQL queries
Ubiquity of tools, technologies, and expertise for working with relational databases
Atomicity, Consistency, Isolation, Durability (ACID) compliance