A Relational Database is a database structured to recognize relations among stored items of information. It organizes data into tables, which consist of rows and columns, with each table representing a different entity. The relationships between tables are established through foreign keys, ensuring data integrity and enabling complex queries across multiple tables. Relational databases use Structured Query Language (SQL) for querying and managing data. They are widely used in various applications, from small-scale systems to large enterprise environments, due to their robustness, reliability, and ease of use.