Why does `std::integral_constant` have a `::type` that refers to itself?

I'm reading the documentation on std::integral_constant, and apparently it includes using type that refers to itself.

template <typename T, T Value>struct integral_constant{    using type = integral_constant<T, Value>;    // ...};

What is this typedef used for?

To access it you already need to know the type, so I don't see what benefit it brings.