Both are same while performing the action but using POST security is there.
Because using GET method in the action, form field values send along with URL, so at the time of sending password, problem will occur means password also will shown in the URL.
Using of POST there is no problem.

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The POST metod is much more faster then GET ..because in GET method the value given in the text field is also available in the URl which takes more excution time for proccesing….In the POST method no information is given to ULR thats why POST is faster then GET method