Differences between XML and HTML files

Html file
<Dl>
<Dt> title </dt>
<Dd> <li> entry </li> </dd>
<Dd> <li> entry 2 </li> </dd>
<Dd> <li> entry 3 </li> </dd>
</Dl>

Xml file
<? Xml version = "1.0" encoding = "gb2312"?>
<Root>
<Items>
<Title> title </title>
<Item> entry </item>
<Item> entry 2 </item>
<Item> entry 3 </item>
</Items>

Differences:
1. tags in html are specific, and each tag has a specific meaning. tags in xml can be defined by users.
2. html tags are mainly used to describe how data is displayed, such as color, italic, and bold. xml only cares about the content of data and does not care about how data is displayed.