An identity document (abbreviated as ID) is a document proving a person's identity.
If the identity document is a plastic card it is called an identity card (abbreviated as IC or ID card). When the identity document incorporates a photographic portrait, it is called a photo ID. In some countries, identity documents may be compulsory to have or carry.
A driver's license, driving licence, or driving permit is a legal authorization, or a document confirming such an authorization, for a specific individual to operate one or more types of motorized vehicles—such as motorcycles, cars, trucks, or buses—on a public road. Such licenses are often plastic and the size of a credit card, and frequently used as an identity card.
In most international agreements, the wording "driving permit" is used, for instance in the Vienna Convention on Road Traffic. Different regions use variations of the terms driver/driver's/driving permit/license/licence – see sections below for the term used in each region.