Why should we care about the different versions of HTML?

There are several different versions of HTML and XHTML that you can use to write Web pages. But does it really matter if you are using a specific one or not? The first thing you need to decide is whether to use HTML or XHTML and then from there, you can choose a version of each to write. And if you understand the differences you'll make an informed decision.

• Why are There Different Versions of HTML?