Relational queries is a formal academic concept and methodological approach for retrieving and manipulating data stored within relational database systems. It provides a structured means to access information based on the logical relationships defined between data elements across different relations (tables). This concept investigates the declarative specification of data retrieval and manipulation operations using formalisms rooted in relational algebra and calculus. Key characteristics include its set-based nature, the use of specific operators (such as selection, projection, and join) to filter, combine, and transform data, and its provision of a theoretical foundation for practical query languages. Its significance is paramount in relational database theory and its practical application enables efficient and precise data access in modern data management systems.