What is an identifier?
Identifiers are northing but names given to various entities uniquely identified in a program. The name of identifiers must vary in spelling or casing. For instance, MyProg and myProg are two different identifiers. Programming languages, like C# and Visual Basic, strictly restrict the programmers from using any keyword as identifiers. Programmers cannot develop a class whose name is public, because, public is a keyword used to state the accessibility of data in programs.