• this – is a DOM element you assigned the event handler to
• $(this) – is a jQuery object created from that element
• $this – is usually used to store the result of $(this)
• $() function as a shorthand for jQuery()

Example

$("#someElement").click(function() {
    this;    // the element itself
    $(this); // a jQuery wrapper-object around the element
    $this = $(this);
});

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Author: Albert