`std::error_condition` is a part of the C++ Standard Library, specifically within the `<system_error>` header. It represents a condition that indicates an error, but it is more general than an error code. This allows for better interoperability between different libraries and systems, as it can represent errors in a way that is not tied to a specific implementation. The primary purpose of `std::error_condition` is to provide a way to categorize errors without being specific to a particular error code. It can be used alongside `std::error_code` to handle errors more effectively, allowing developers to write more robust and portable code when dealing with error handling in their applications.