The function of a relational database is to store, manage, and organize structured data in a way that enables easy retrieval and manipulation. Relational databases use tables to represent data and relationships between different data entities, allowing for efficient data querying and analysis. This structure supports the use of SQL (Structured Query Language) for performing operations such as inserting, updating, and deleting data. With their ability to enforce data integrity and consistency, relational databases are widely used across various industries to support critical applications and decision-making processes.