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Namespaces are used to classify classes and other namespaces that perform a similar function. They can be used for example to disambiguate between classes that may have same names but different functions.

For instance, a class named "Font" could be present in libraries for printing, displaying fonts on a monitor, etc. A Point may have different implementations depending on the context; one may be for graphing and another might be for window positioning.

Namespaces are also commonly used in XML documents. In Java, packages are used to perform the same function.