Apollo API or Apollo Client is a comprehensive state management library for JavaScript that enables you to manage local and remote data with GraphQL. This is used to fetch, cache, and modify application data while automatically updating your UI. As shown in the below diagram, the long-term signals interact with the Realtime Vectors. In a RESTful world, APIs have versions, and as APIs evolve, API version numbers increase. Furthermore, as long as services keep on improving, version numbers never stop incrementing. At the same time, there are two types of services: QUERY and MUTATIONS. It is perfect for Cassandra usage where users do not get to execute forbidden queries like select * from myHugeMirror and make the database blow up by allowing for a full-table scan.
