The Difference Between HTML and XHTML Conversions
The average user browsing a website does not care about what goes on under the hood. They are simply concerned with how things look and if it works or not. Web developers, however, view web pages in a different perspective and must understand the differences between HTML and XHTML, for instance.
Ultimately, either of the two languages will create web pages that look exactly the same. The real difference comes in the language syntax and strictness. XHTML is basically the HTML language that has been structured around XML. Therefore, the language is cleaner and compatible with most browsers, which is why most developers do PSD to XHTML conversions when building a website.