The concept of schema stitching in GraphQL allows developers to merge multiple GraphQL schemas into one unified API, making it easier to access data from different sources. This enables a single request to fetch data from all the APIs involved, reducing the complexity and number of roundtrips required. The technology has already undergone active testing and is being refined through community feedback. It aims to provide a more seamless and efficient way to develop APIs, especially in scenarios where microservices or public APIs speak GraphQL. The schema stitching concept can help bridge the gap between different data sources and enable new use cases such as combining internal schemas with external ones, adding public APIs, or creating mashup APIs.