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I often see this as the first line of a plug-in:
$this = $(this);
Is this just for efficiency, to avoid getting the jQuery object each and every time?
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The value of this inside a click event is a DOM element (the one that was clicked). Using $(this) converts it to a jQuery object. DOM elements do not have a hide() methods, but jQuery adds that and many other methods you can then call.
$(this) is a jQuery wrapper around that element that enables usage of jQuery methods. jQuery calls the callback using apply() to bind this . Calling jQuery a second time (which is a mistake) on the result of $(this) returns an new jQuery object based on the same selector as the first one.
To cache the jQuery object and not have to instantiate it every time they require it.
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