identification

ID is the abbreviation of English IDentity, which means identification number, and it is a code and unique. It is equivalent to an ID card, and its ID number is unchanged in a specific thing. As for what to use to identify this thing, it is determined by the rules formulated by the designer.

For computers, there are two operation modes, logical operation and arithmetic operation. For logical operation, it is the ID function of numbers. Of course, ID is actually very common in life. For example, if you stick the product model and production number on similar things to distinguish them, this is also called ID.