A relational database is a type of database that stores and organizes data in a structured manner, using tables, columns, and rows to establish relationships between different pieces of information. This allows for efficient storage, retrieval, and manipulation of data, as well as the ability to perform complex queries and analysis. Unlike other types of databases, a relational database follows a set of rules, known as relational algebra, to ensure data integrity and consistency. This makes it a powerful tool for managing large amounts of data in a logical and organized manner, making it a cornerstone of modern data management systems.