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A patch is an immediate response  to a situation.  if a software company identifies a specific issue with their product and the situation is pausing a threat to the operation of the product , they will appoint a team of experts who will work on the situation to find out a solution. It is called a Patch or Hot fix.  It is not a planned situation and address that  specific problem only .

A  service Pack is a planned collection of patches and fixes that is targeting  a  large group of customers than just addressing a specific situation .