The function `std::remove` is part of the C++ Standard Library, specifically included in the `<algorithm>` header. It is used to remove elements from a container that match a specified value. However, it does not actually erase the elements; instead, it shifts the remaining elements to the front and returns an iterator pointing to the new logical end of the container. To truly remove the elements from the container, you typically follow `std::remove` with the container's `erase` method. This combination effectively reduces the size of the container by eliminating the unwanted elements. This technique is commonly used with standard containers like `std::vector` and `std::list`.