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An API isn't really a user interface, by definition it is a <i>Application Interface.</i>.<br />
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<a href="http://en.wikipedia.org/wiki/Application_programming_interface" rel="ugc">API</a>
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An API isn't really a user interface, by definition it is a Application Interface..

API [http://en.wikipedia.org/wiki/Application_programming_interface]

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Yes, that was my thought.<br />
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Actually my question is incomplete (my apologies), I forgot to mention that the API is for authentication and I believe that the websites that do not run on these APIs use cookies, right?<br />
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Either way, from a user perspective he shouldn't notice what is going on.
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Yes, that was my thought.

Actually my question is incomplete (my apologies), I forgot to mention that the API is for authentication and I believe that the websites that do not run on these APIs use cookies, right?

Either way, from a user perspective he shouldn't notice what is going on.

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Web sites that use APIs also use cookies. &nbsp;Virtually all web sites that need to keep track of the users do so with cookies.
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Web sites that use APIs also use cookies.  Virtually all web sites that need to keep track of the users do so with cookies.

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From UX point of view, what is the functional difference between websites that run on APIs and websites that don't run on APIs?
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From UX point of view, what is the functional difference between websites that run on APIs and websites that don't run on APIs?

Difference between websites that run on APIs with the ones that don't run on API's?

Web development software is used to create websites for both the Internet and intranets. Software can be either locally installed or operated through a cloud interface, and ranges in complexity from simple text editors to full-fledged integrated development environments (IDEs) that include graphics, video, audio, scripting and database support.

Web Development Software

Programming includes both the specifics of the language you’re using, like Visual Basic, .NET, Java and others, but also the best practices in user experience and interfaces and the management of projects, version control and development. Other programming topics are related to web and cloud development and system and hardware programming.