When I first started practicing Zen, hearing even just this short “classification” of the different kinds of meditation really convinced me I had found the right teacher. And why is this important? Nowadays, there is a massive proliferation of so-called “meditation apps”, most of which are just relaxation sessions. While “being relaxed” is certainly not a bad thing, at all, it might not really lead to true liberation. It might not produce prajna, or wisdom. And it definitely won’t carry one through with wide-eyed clarity the transition from life to death, and beyond.
This excerpt of a chapter of The Compass of Zen (Boston: Shambhala, 1997) explains it all quite clearly for you.
(I do not receive any compensation, financial or otherwise, from this book.)