GraphQL, a modern API technology developed by Facebook and governed by the GraphQL Foundation, offers a flexible alternative to traditional REST APIs by allowing clients to specify exactly the data they need, thus addressing issues of under-fetching and over-fetching associated with REST. Unlike REST, which centers around resources identified by URLs and standard HTTP verbs, GraphQL employs a type system to describe complex objects and their relationships, enabling clients to perform efficient queries and mutations with precise control over the data model. This specification supports real-time updates via Subscriptions, offering an opinionated solution that many GraphQL libraries implement using WebSockets. While REST boasts maturity and simplicity with a robust ecosystem and widespread developer familiarity, GraphQL introduces advantages in efficiency, versioning, and real-time data handling, appealing especially to mobile and data-intensive applications. Transitioning from REST to GraphQL can be facilitated by layering GraphQL capabilities on top of existing REST-based services, offering a pathway to leverage the benefits of GraphQL without a complete overhaul.