Description: A query parameter is a fundamental element in APIs that allows developers to filter or modify the data returned in a query. These parameters are used to specify additional criteria that affect the server’s response, allowing for greater customization and efficiency in data retrieval. In the context of various API designs, query parameters enable users to request only the fields they need, optimizing bandwidth usage and improving response speed. In REST, query parameters are typically included in the URL, preceded by a question mark, and can be used to sort, filter, or paginate results. The flexibility they offer is crucial in modern applications, where the amount of data can be overwhelming and the need for quick, specific responses is essential. Additionally, their implementation can vary depending on the technology used, including systems that can query large volumes of data. In summary, query parameters are key tools that allow developers to interact more effectively with APIs and databases, enhancing user experience and system efficiency.