What is the purpose of namespaces in C++?

In C++, namespaces are used to divide the global namespace into smaller sections to avoid naming conflicts. They provide a container to organize related functions, classes, variables, etc. and give them a unique identifier.

There are several main functions of a namespace:

1. Avoiding naming conflicts: When the same identifier is used in different code modules, namespaces can separate them, giving them different scopes in different namespaces. This way, even if the identifiers are the same, they will not conflict.
2. Provide modular organization: namespaces can group related functions, classes, variables, etc. together, providing a logical modular structure that makes the code clearer and easier to understand.
3. Controlling the visibility of identifiers: By using namespaces, one can manage which identifiers are visible in a specific scope, thus reducing namespace pollution and the reliance on global variables.
4. Extension and integration of support library: Most of the content in the C++ standard library is included in the std namespace, allowing for separation of standard library functions from user-defined code for easy extension and integration.

In conclusion, namespaces in C++ help organize code, prevent naming conflicts, and limit the visibility of identifiers, ultimately improving the readability and maintainability of the code.