Dollar Sign is nonetheless an alias for JQuery. You can write jQuery syntax using $ sign or jQuery.
This can also be called Selector($).
This can be called as an expression for identifying target elements on a page that allows  to easily identify and also  grab elements required.
The below 2 syntaxes are the same to create a function using jQuery.
To collect a group of elements, we use the simple syntax $(selector) or jQuery(selector).
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$(document).ready(function()
{
   
});
OR
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jQuery(document).ready(function()
{

});
Example for a Hyperlink Click
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1.$("a").click(function() {});