The $ is simply a variable that represents the jquery object. You could instead type
jquery(‘#para’).hide(); *see my note at bottom
but using the $ instead of jquery is much faster.
Notice the parenthesis that come after $
they contain the selector. In this case we are selecting the element that has the id of para. jQuery will then do something with that element. (An element is another way to say a tag.)
Once jQuery has selected the element it will do something to it. In this case we call the hide method to hide the element. It will disappear!
var para = document.getElementById(‘para’);