what is $ in javascript

In JavaScript, the dollar sign ($) is not a predefined operator or syntax, but it is commonly used as a convention in libraries, frameworks, and custom code for various purposes. However, the symbol $ is not used alone in JavaScript. The void operator, on the other hand, is a built-in operator in JavaScript that evaluates an expression and returns undefined. It is often used to obtain the undefined primitive value, using "void(0)" (useful when evaluating an expression without using the return value) .