most of the time your broweser is using the GET method. when u see in the URL in the broweser code like this at the end: ?ubb=reply&f=50 etc u send the parametrs using the GET. you can specify to send the paramaters using more secure mthods wih the POST method like in forms etc.
To send information on server side post method is used. Using Get we send limited informaiton to server side 240 characters approx. Get method is not secure because when we send information using Get our information is on address bar.e.g password etc.