Query Processing is the method by which a database management system interprets and executes requests made by users. When a user submits a query, the system analyzes it to understand what data is being requested and how to retrieve it efficiently. This involves parsing the query, optimizing it for performance, and generating an execution plan. Once the execution plan is created, the system retrieves the relevant data from the database. This process may involve searching through tables, applying filters, and joining data from multiple sources. The final result is then returned to the user in a structured format, such as a table or report.