Differences between std::is_convertible and std::convertible_to (in practice)?

std::is_convertible<From, To> (the type trait) checks is type From is implicitly convertible to type To.

std::convertible_to<From, To> (the concept) checks that From is both implicitly and explicitly convertible to To. It’s rare that this is not the case, such types are ridiculous, but it’s nice in generic code to just not have to worry about that case.

One example:

struct From;
struct To {
    explicit To(From) = delete;
};
struct From {
    operator To();
};

static_assert(std::is_convertible_v<From, To>);
static_assert(not std::convertible_to<From, To>);