Also known as serial number or account number, it is a relatively unique code in a certain system, which is equivalent to an "ID card". In a specific matter, the ID number is generally unchanged. As for what to use to identify that thing, it is determined by the rules formulated by the designer himself.
This rule is designed subjectively according to the specific use environment, such as "employee number", "ID number" and "computer website". There are two main ways of computer operation, logical operation and arithmetic operation. Logical operation is related to the ID function of numbers.
ID is very common in life. For example, the product model and production number can be pasted on similar things to distinguish them. This can also be called ID.
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In terms of identification, ID card, household registration book, passport, temporary residence permit (it is said that it has been banned), confirmation letter, permanent residence certificate (commonly known as green card, because American permanent residence certificate is green), driver's license, health certificate and so on. It is commonly used. These identification methods record names, addresses, places of birth and dates of birth.
With the development of technology, some identification methods begin to use anti-counterfeiting identification, then bar code, then magnetic stripe, and then integrated circuit chip. Other methods (although not widely used) include fingerprints, iris, voice, DNA, relatives and friends. Although everyone's voice is different, using voice as identification may be just fiction.
Fingerprints, irises and DNA are very formal and are usually used to identify prisoners on death row. Because the commonly used identification methods are easier to forge. Sound and iris are also affected by health.
Baidu encyclopedia -id (identification number)