👉 In programming, a "proto" in C++ is used to represent a type that extends another type. It's like defining a new class or struct with a base class and derived classes. For example: ```cpp class Base { public: int val; }; class Derived : public Base { public: int val; }; int main() { Base b = {1, "one"}; Derived d = b; std::cout << "b.val: " << b
