 <p>We know what is a "site" and "application", so all we got left is <a href="http://en.wikipedia.org/wiki/World_Wide_Web" rel="nofollow noreferrer">The Web</a></p> <p>Now, a web application may be a part of a whole website. A website is comprehended of web applications. Though usually you'll see that a website has only one web application.</p> <p>For instance, you have an iPhone <em>device</em> (compared to a website) which may include different applications: playing music, videos, web browser etc.</p>