What is auto keyword in C++?

Question

What is its functionality?

Answer 1

https://en.cppreference.com/w/cpp/language/auto

Type deduction during initialization. The 'auto' keyword tells the compiler to deduce the type of a variable from its initialization expression.

How is it useful?

Instead of doing

std::vector<std::vector<std::string>> obj = new std::vector<std::vector<std::string>>;

you can now do

auto obj = new std::vector<std::vector<std::string>>();

Answer 2

Thanks for helping