Where is kelp found?

Could you kindly enlighten me on the location of kelp? I'm particularly interested in understanding where this marine plant is typically found. Could you possibly elaborate on the habitats that kelp prefers, perhaps mentioning the specific oceanic regions or conditions that are conducive to its growth? Additionally, are there any particular depths or water temperatures that kelp is known to thrive in? Your insights would be greatly appreciated as I seek to broaden my knowledge on this fascinating subject.