What is the difference between std::copy and std::move?

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**copy** — copies elements. **move** — moves elements. **std::copy:** - Copies elements. - Source unchanged. ```cpp std::vector src = {1, 2, 3}; std::vector dst(3); std::copy(src.begin(), src.end(), dst.begin()); // src: 1, 2, 3 (unchanged) // dst: 1, 2, 3 ``` **std::move (algorithm):** - Moves elements. - Source in valid but unspecified state. ```cpp std::vector src = {"a", "b", "c"}; std::vector dst(3); std::move(src.begin(), src.end(), dst.begin()); // src: "", "", "" (moved from) // dst: "a", "b", "c" ``` **std::move (cast):** - Casts to rvalue reference. - Enables move semantics. ```cpp std::string s1 = "hello"; std::string s2 = std::move(s1); // s1 is now empty ```

C++: What is the difference between std::copy and std::move?