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Snippet from Wikipedia: Namespace

In computing, a namespace is a set of signs (names) that are used to identify and refer to objects of various kinds. A namespace ensures that all of a given set of objects have unique names so that they can be easily identified.

Namespaces are commonly structured as hierarchies to allow reuse of names in different contexts. As an analogy, consider a system of naming of people where each person has a given name, as well as a family name shared with their relatives. If the first names of family members are unique only within each family, then each person can be uniquely identified by the combination of first name and family name; there is only one Jane Doe, though there may be many Janes. Within the namespace of the Doe family, just "Jane" suffices to unambiguously designate this person, while within the "global" namespace of all people, the full name must be used.

Prominent examples for namespaces include file systems, which assign names to files. Some programming languages organize their variables and subroutines in namespaces. Computer networks and distributed systems assign names to resources, such as computers, printers, websites, and remote files. Operating systems can partition kernel resources by isolated namespaces to support OS-level virtualization containers.

Similarly, hierarchical file systems organize files in directories. Each directory is a separate namespace, so that the directories "letters" and "invoices" may both contain a file "to_jane".

In computer programming, namespaces are typically used to group symbols and identifiers around a given task and to avoid name collisions between multiple identifiers that share the same name.

In computer networking, the Domain Name System organizes websites (and other resources) into hierarchical namespaces.

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