Documentation vs Multi-line

Question

I still don’t understand what the difference is between a documentation. Please explain!

Answer 1

/* this is multiline comment */
/** This is document */
the document is something like where you provide additional info like author, parameters etc
e.g. Let's say there is a function countCharacters() that takes a string as a parameter and returns the number of characters in it.
/**
*@author Rishi
*
*@param {String} input string
*
*@return {String} number of characters
*
*/

though you can provide the same information using multi-line comment but the use of document instead of a multiline comment for providing this info is the best practice.