Traits can also be generic. This is useful in scenarios where you want to implement a trait for a wide variety of types:

pub trait From<T> {
    fn from(T) -> Self;
}

Two such examples are is the From<T> and Into<T> traits, which allow from conversion from a type to a type T and vice versa. Their use becomes prominent when these traits are used as trait bounds in function parameters. We'll see what trait bounds are and how they work in a moment. However, generic traits can get quite verbose when they are declared with three or four generic types. For those cases, we have associated type traits.