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CDATA - (Unparsed) Character Data
The term CDATA is used about text data that should not be parsed by the XML parser.

Characters like “<" and "&" are illegal in XML elements.

"<" will generate an error because the parser interprets it as the start of a new element.

"&" will generate an error because the parser interprets it as the start of an character entity.

Some text, like JavaScript code, contains a lot of "<" or "&" characters. To avoid errors script code can be defined as CDATA.

Everything inside a CDATA section is ignored by the parser.

A CDATA section starts with "<![CDATA[" and ends with "]]>“:

<script>
<![CDATA[
function matchwo(a,b)
{
if (a < b && a < 0) then
   {
   return 1;
   }
else
   {
   return 0;
   }
}
]]>
</script>

In the example above, everything inside the CDATA section is ignored by the parser.

Notes on CDATA sections:
A CDATA section cannot contain the string “]]>”. Nested CDATA sections are not allowed.

The “]]>” that marks the end of the CDATA section cannot contain spaces or line breaks.