What is the difference between XML and HTML tags?

[SubhanUllah]

XML doesn’t tolerate syntax errors. HTML does, with specifications on to correct them.

XML tags have to be closed. They can auto-close, like <stuff/> which is equivalent to <stuff></stuff>. HTML tags that are meant to be empty, don’t need a syntax that closes them.

XML tags’ attribute values have to be quote. It’s <a thing="stuff"> or <a thing='stuff'> but not <a thing=stuff>

XML tags don’t tolerate < other than to open a tag. If you want the text < in XML you need &lt; . In HTML you can use < if it doesn’t look like a correct tag opening.

That’s just the obvious. There are many others.