`std::move` is a utility in the C++ Standard Library that enables the transfer of resources from one object to another. It allows developers to indicate that an object can be "moved from," meaning its resources can be transferred rather than copied. This is particularly useful for optimizing performance, especially with large objects, as it avoids unnecessary deep copies. When you use `std::move`, it casts an object to an rvalue reference, which can then be used by move constructors or move assignment operators. This helps in efficiently managing memory and resources, making programs faster and more resource-efficient, especially in scenarios involving temporary objects or containers like `std::vector`.