What is identifier in java?

Question

The name used in a java is called an identifier or label name
https://code.sololearn.com/WNz28mdxLDp3/?ref=app

Answer 1

Identifiers are the names of variables, methods, classes, packages and interfaces. Unlike literals they are not the things themselves, just ways of referring to them. In the HelloWorld program, HelloWorld, String, args, main and println are identifiers.

Identifiers must be composed of letters, numbers, the underscore _ and the dollar sign $. Identifiers may only begin with a letter, the underscore or a dollar sign.