what is identifier
An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique class of objects, where the object or class may be an idea, physical [countable] object (or class thereof), or physical [noncountable] substance (or class thereof).n most languages, some character sequences have the lexical form of an identifier but are known as keywords â for example, if is frequently a keyword for an if clause, but lexically is of the same form as ig or foo namely a sequence of letters.