A look at the standard format and details.
A typical IDP includes your name, photo, and license details translated into multiple languages, formatted in a standardized booklet style recognized across many countries. This multilingual format is the core value of the document — it lets an officer or rental agent in a country where you don't speak the language still understand your license details.
The permit is meant to accompany your original license at all times, not replace carrying it, since authorities typically want to see both together.