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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.[1] In some countries, identity documents may be compulsory or non-compulsory to have.
The identity document is used to connect a person to information about the person, often in a database. The connection between the identity document and database is based on personal information present on the document, such as the bearer's full name, birth date, address, an identification number, card number, gender, citizenship and more. A unique national identification number is the most secure way, but some countries lack such numbers or do not show them on identity documents.
In the absence of an explicit identity document, other documents such as driver's license may be accepted in many countries for identity verification. Some countries do not accept driver's licenses for identification, often because in those countries they do not expire as documents and can be old or easily forged. Most countries accept passports as a form of identification. Some countries require all people to have an identity document available at all times. Many countries require all foreigners to have a passport or occasionally a national identity card from their home country available at any time if they do not have a residence permit in the country.