What is $ ?

Answer 1

Hi Amber
As @KrOW says if you see $ signs in web code it normally indicates that the code uses the jQuery libraries. You can also check in the HTML for something like this.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
I see a lot of cut and paste code here in the playground. Its better to learn HTML5 and CSS proficiently as many things in jQuery can be achieved in modern web standards.
try http://vanilla-js.com/

Answer 2

Its a character but more probably you refer to JQuery function then search it on google

Answer 3

$ can also be used to designate a variable in PHP code:
$this_is_a_variable = "some data";

Answer 4

a dollar sign