GraphQL is an application query language that allows developers to ask for specific data from the server, rather than exposing all capabilities of backends and databases. This approach makes it easier to secure GraphQL servers compared to traditional RESTful APIs. Building a GraphQL server is also relatively easy, requiring only defining a schema and resolve functions to fetch data. Various clients, including Relay, Apollo Client, and Lokka, are available for integrating with different frameworks such as React, Angular, Ember, and Redux.