I am working on a project with quite a lot of JQuery in it. The JQuery has a lot of $ signs everywhere, for example

$(document).ready(function () {
        $('input[type=file]').wl_File({
            url: '/Admin/PolicyInventory/UploadDocuments',
            onFileError: function (error, fileobj) {
                $.msg('file is not allowed: ' + fileobj.name, {
                    header: error.msg + ' Error ',
                    live: 10000
                });
            }
        });
...

My question is, what does this dollar sign mean? Why is it used all over the place and how do I understand and interpret it? It reminds me of the scary days of when I was learning Scheme at University and had to put brackets everywhere without knowing why I was doing it.

jquery
Edit
Report