A translation booklet that is carried with your government issued drivers license when driving outside of the US. It is intended for the foreign officials to be able to read your actual state issued drivers license. IDL's are typically translated into French, Spanish, English, Italian, Russian, Arabic, German, Chinese, Japanese, and Portuguese. Some countries do require that you present an IDL at time of pick up, in order to check out the rental vehicle. The cost of an IDL is usually around $20 USD and can be purchased at your local AAA office.