Apollo Client is a new GraphQL client designed to simplify data fetching in React applications, particularly those using Redux. It aims to provide a transparent and simple data flow model, making it easier for developers to manage server-side data fetching while maintaining control over their app's state. The client integrates seamlessly with Redux and has a self-contained architecture that allows for easy installation via npm install apollo-client react-apollo. Apollo Client enables declarative data loading, similar to React's connect function, but with the added benefit of automatic tracking of query loading using Redux devtools. It also supports using Redux state in queries, making it easier to control what data is fetched from the server based on client-side state. The client provides a hands-on approach to learning and using GraphQL, allowing developers to try it out now by reading the documentation and exploring sample components.