The GRANDstack is a full-stack framework for building applications with GraphQL, React, Apollo, and Neo4j Database. It makes handling complex data easy by modeling real-world data and relationships using Neo4j and GraphQL, allowing developers to create CRUD mutations automatically and override them as needed. The framework also enables the use of Cypher directives to add properties to GraphQL types and make the most of Neo4j. Additionally, GRANDstack allows for custom resolvers and queries in APOC and Cypher to create what's needed, making it easier to model real-world data such as oil and gas ownership relationships with many different types of ownership and directions of relationships involved.