The GenAI Starter Kit is a pre-packaged solution for building generative AI (GenAI) applications with Spring AI in Java. It provides a simplified process by including starter kit projects with key technologies, such as Neo4j and OpenAI models. The project uses Neo4j to store structured data and unstructured text data with vector embeddings, allowing for similarity searches and retrieval queries. The application model consists of domain classes that map entities to the database model, and a controller class that handles user requests and generates responses using the Neo4jVectorStore and OpenAiChatClient beans. The starter kit includes examples and resources for getting started with GenAI and beyond.