[jQuery] Difference of $.getJSON versus $get

[jQuery] Difference of $.getJSON versus $get


What's the difference of $.getJSON versus $.get? I currently use
$.getJSON to load JSON data but I can't see any advantages.
Is $.getJSON just another way for
$.ajax({
type: "GET",
url: "link name",
dataType: "json",
complete: "function name"
})
or is the callback excuted only when "success"?
What means "data" in the POST case? How could I access this data on
the server, e.g. in PHP?
O. Wyss