Difference Between Similar Terms and Objects

Difference Between API and Web Service

sklagAPI vs Web Service

API and Web service serve as a means of communication. The only difference is that a Web service facilitates interaction between two machines over a network. An API acts as an interface between two different applications so that they can communicate with each other. An API is a method by which the third-party vendors can write programs that interface easily with other programs. A Web service is designed to have an interface that is depicted in a machine-processable format usually specified in Web Service Description Language (WSDL). Typically, “HTTP” is the most commonly used protocol for communication. Web service also uses SOAP, REST, and XML-RPC as a means of communication. API may use any means of communication to initiate interaction between applications. For example, the system calls are invoked using interrupts by the Linux kernel API.

An API exactly defines the methods for one software program to interact with the other. When this action involves sending data over a network, Web services come into the picture. An API generally involves calling functions from within a software program.

In case of Web applications, the API used is web based. Desktop applications such as spreadsheets and word documents use VBA and COM-based APIs which don’t involve Web service. A server application such as Joomla may use a PHP-based API present within the server which doesn’t require Web service.

A Web service is merely an API wrapped in HTTP. An API doesn’t always need to be web based. An API consists of a complete set of rules and specifications for a software program to follow in order to facilitate interaction. A Web service might not contain a complete set of specifications and sometimes might not be able to perform all the tasks that may be possible from a complete API.

The APIs can be exposed in a number of ways which include: COM objects, DLL and .H files in C/C++ programming language, JAR files or RMI in Java, XML over HTTP, JSON over HTTP, etc. The method used by Web service to expose the API is strictly through a network.


1. All Web services are APIs but all APIs are not Web services.

2. Web services might not perform all the operations that an API would perform.

3. A Web service uses only three styles of use: SOAP, REST and XML-RPC for

communication whereas API may use any style for communication.

4. A Web service always needs a network for its operation whereas an API doesn’t need

a network for its operation.

5. An API facilitates interfacing directly with an application whereas a Web service is a

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  1. really gr8 explanation of difference i`m happy and understood 🙂 thanks again

  2. Nice to read..

  3. Nice basic understanding of the concept

  4. Couldn’t have been a simpler way of explaining this. Thanks so much!

  5. Fantastic explanation!!!

  6. Very nice and up to point explanation. Great job. Thanks

  7. Could Not find better explanation than this. Thank you for writing

  8. Wonderful and Clear Explanation. Solves the intended purpose of differentiating API vs Web Service.

    Thank you.

  9. great explain

  10. That is an amazing work !
    Thank you so much for your time

  11. Good Job Manasa, Well explained and understood the concept of webServices and API in ten mins while reading this article..Thanks for posting good stuff.

  12. very well expalined

  13. Well, explained!

  14. Rather straight forward up to bullet point #5 which reads:
    “5. An API facilitates interfacing directly with an application whereas a Web service is a”

    A Web service is a….what?

  15. Great post, thanks for posting

  16. Clear Explanation
    Thank for Sharing

  17. Great explaination !
    Thanks for sharing.

  18. Thank you for this article 😉

  19. Good explanation..

  20. How fantastic explanation this.

  21. Thank you, so well explaned.


  22. Thanks , exactly what I was looking for. Very well explained.

  23. Crystal clear explanation! Thanks a ton!!

  24. You have amazingly explained the complex concept of APIs and WS, in a very simpler manner. Thanks!

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