Hi Marvel ...... From Australia, although I have lived and worked in several other countries: For my thinking, a Prawn is a larger creature then a shrimp. The 'Shrimps' I've had in many countries are about 3cm or so before cooking whereas Prawns are 10cm or more and one Prawns meat is worth about 15 shrimp meats. Shrimps are used in Nasi Goreng type meals or potted in little pots, Prawns are sometimes skewered or in Garlic or Chilli sauce.: see ..https://www.foodandwine.com/seafood/shellfish/whats-difference-between-shrimp-and-prawns
Where are you from?