When is a CDATA section necessary within a script tag?

Question

Are CDATA tags ever necessary in script tags and if so when?

In other words, when and where is this:

Answer 1

It's an X(HT)ML thing. When you use symbols like < and > within the JavaScript, e.g. for comparing two integers, this would have to be parsed like XML, thus they would mark as a beginning or end of a tag.

The CDATA means that the following lines (everything up unto the ]]> is not XML and thus should not be parsed that way.