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Id is an identifier assigned to a variable, function, class, module, namespace or other object in programming. It distinguishes one entity from another within the scope of the program. In many languages such as Python or JavaScript, these identifiers have their own set of rules for naming them; they may begin with an underscore or letter and typically can consist of underscores, letters and digits. Ids must be unique within their respective namespace to avoid ambiguity in the codebase when it's being interpreted by the compiler or runtime environment.

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