Description: A schema reference in GraphQL is a pointer to another schema or type, allowing developers to structure their queries more efficiently and modularly. This concept is fundamental in GraphQL as it enables the reuse of types and schemas, facilitating the creation of cleaner and more organized APIs. Schema references allow one object type to reference another, helping to maintain data consistency and integrity. Additionally, by using references, unnecessary code duplication can be avoided, and the readability of queries is improved. This is especially useful in large and complex applications where multiple data types may be interrelated. Schema references also allow developers to define relationships between different data types, such as one-to-many or many-to-many, which is essential for properly modeling business logic in an API. In summary, schema references are a powerful tool in GraphQL that promotes modularity and clarity in API design, enabling developers to build more robust and maintainable applications.