The State of the API 2021 report highlights GraphQL's growth and adoption, with a significant increase in users who love it. According to the report, GraphQL shows strong growth, has the largest percentage of users who love it, and is the only API specification amongst future technologies that developers are excited about. The report also shows that GraphQL has surpassed JSON Schema, Swagger 2.0, and OpenAPI 3.0 in terms of use and adoption, with a notable increase in its user base. Additionally, the report predicts that GraphQL will continue to grow and be used by more developers, with an expected 80% adoption rate by 2025. The growth of GraphQL is attributed to its ability to provide real-time data and improve developer experience.