What is an Identifier in Programming?

An identifier is a name given to a variable, function, class, or other object in a programming language. It is used to uniquely identify the object and make it accessible within the program.

In other words, an identifier is a label that is assigned to a particular entity in the code, such as a variable, a function, or a class, and it is used to reference that entity throughout the program.

For example, in the code `int x = 5;`, `x` is an identifier that refers to a variable with the value 5. Similarly, in the code `void myFunction(int y) { ... }`, `myFunction` is an identifier that refers to a function that takes an integer argument `y`.

Identifiers can be composed of letters, digits, and underscores, and they must begin with a letter or an underscore. They cannot begin with a number or a special character. In most programming languages, identifiers are case-sensitive, meaning that `MyVariable` and `myvariable` are considered different identifiers.