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GraphQL is a query language for your API, not for the database. It allows clients to query data from multiple sources in the API at one request. GraphQL has some problems as well, for instance, the famous N+1 problem. We will learn about GraphQL and basic types for creating GraphQL schemas in this blog. Every GraphQL service has a query type and may or may not have a mutation type. We can query the data from API using those types and perform Mutation on those types.