.append(), prepend(), .after() and .before()

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I am pretty proficient with coding, but now and then I come across code that seems to do basically the same thing. My main question here is, why would you use .append() rather then .after() or vice verses?

I have been looking and cannot seem to find a clear definition of the differences between the two and when to use them and when not to.

What are the benefits of one over the other and also why would i use one rather then the other?? Can someone please explain this to me?

var txt = $('#' + id + ' span:first').html();
$('#' + id + ' a.append').live('click', function (e) {
    e.preventDefault();
    $('#' + id + ' .innerDiv').append(txt);
});
$('#' + id + ' a.prepend').live('click', function (e) {
    e.preventDefault();
    $('#' + id + ' .innerDiv').prepend(txt);
});
$('#' + id + ' a.after').live('click', function (e) {
    e.preventDefault();
    $('#' + id + ' .innerDiv').after(txt);
});
$('#' + id + ' a.before').live('click', function (e) {
    e.preventDefault();
    $('#' + id + ' .innerDiv').before(txt);
});

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