An IDL is essentially a translation document of your driver’s license in several different languages, including Arabic, Spanish, and English. It is used to translate your driver’s license into a language that your destination country understands. It is by no means a replacement for your original driver’s license or a legal document like a passport. An IDL is only valid if you have your original license with you. Some countries, car rental agencies, insurance companies, and/or traffic authorities may ask to see your IDL whenever you are abroad so it is best to keep one handy at all times.