abstraction
The process of picking out (abstracting) common features of objects and procedures. A programmer would use abstraction, for example, to note that two functions perform almost the same task and can be combined into a single function. Abstraction is one of the most important techniques in software engineering and is closely related to two other important techniques — encapsulation and information hiding. All three techniques are used to reduce complexity.
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Same as password, a series of characters and numbers that enables a user to access a computer.