Explain API with an example.

 An Application Programming Interface (API) allows two systems to communicate and exchange data. For instance, when registering on Amazon, users may have the option to sign up using their Google or Facebook credentials.

  1. Amazon requests personal information from Facebook.
  2. Facebook retrieves and validates the user’s details (such as email and name) from its database.
  3. Facebook sends the verified data back to Amazon, allowing the registration process to proceed seamlessly.

Popular API testing tools include Postman and SoapUI, which are used for validating API requests and responses.

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