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Relational databases are a type of database management system that stores data in tables and enforces relationships between them using primary and foreign keys. They are designed to handle large amounts of structured data, making them an essential tool for businesses and organizations seeking to efficiently manage and analyze their information. In the hierarchy "Technology/Data Science/Database Administration/Relational Databases," relational databases fall under the category of database administration, which is a subfield of data science within technology. They are used to implement relational models, allowing for efficient querying and manipulation of data through SQL (Structured Query Language). This makes them an important tool in the field of data science, where they can be used to extract insights from large datasets and support decision-making processes. Overall, relational databases play a crucial role in managing and analyzing structured data within technology, data science, and database administration.