Relational Database
A relational database is a type of database that organizes data into structured tables with rows and columns, where relationships between data are defined through keys. It uses Structured Query Language (SQL) for querying and managing data, ensuring data integrity through constraints like primary keys, foreign keys, and normalization. This model is widely used for applications requiring complex queries, transactions, and consistent data storage.
Developers should learn and use relational databases when building applications that require ACID (Atomicity, Consistency, Isolation, Durability) compliance, such as financial systems, e-commerce platforms, or any scenario with complex relationships and data integrity needs. They are ideal for structured data with predefined schemas, supporting efficient joins and transactions, making them a foundational skill for backend development and data management.