SQL Database
An SQL database is a relational database management system (RDBMS) that stores and organizes data in tables with rows and columns, using Structured Query Language (SQL) for querying and manipulating data. It ensures data integrity through ACID (Atomicity, Consistency, Isolation, Durability) properties and supports complex transactions. SQL databases are widely used for applications requiring structured data, such as e-commerce, banking, and enterprise systems.
Developers should learn SQL databases when building applications that require reliable, structured data storage with strong consistency and complex querying capabilities, such as financial systems, inventory management, or customer relationship management (CRM) tools. They are essential for scenarios involving transactions, data relationships, and reporting, where data accuracy and integrity are critical.