A compliant translation reproduces every field on both sides of your licence — your full name, date of birth, licence number, vehicle classes and restrictions, and the issue and expiry dates — so an authority reading it sees exactly what the original says, in English.
Certification is what separates it from a casual translation. In Australia, the translator holds a NAATI credential (CPN) that anyone can verify in NAATI's public online directory — and translations from anyone else can be refused at the counter. NSW licence conversion goes further, accepting only Transport for NSW's named sources.
You will use the same certified PDF to drive legally on your overseas licence, convert to a local licence, pick up rental cars, prove your identity at banks, and satisfy insurers. One document, every counter.