Is there any specific reason behind using $ with variable in jQuery

Question

I know it\'s a silly question but I am a bit confused with this. For example, if I have an input with an ID: rad1, is there any difference between below lines o

Answer 1

It's only for showing that it's a Jquery variable.

Declaring $a you're showing that your variable is for JQuery objects, it's just a notation. So the most readable thing will be to declare Jquery variable with $ notation

var $obj=$("#obj");

And DOM element without $ notation

var obj = document.getElementById("obj");