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API testing focuses on testing the business logic or the functionality of the application. Using API testing you are also validating the data responses, as well as ensuring whether your APIs are performant and secure. API testing can be performed a lot quicker than browser testing, when you get to automation, API tests run a lot faster than browser tests as you are skipping the entire UI layer and jumping directly to the API layer. The benefits of API testing include early access to the application functionality and you can catch bugs earlier in the development process.