Kayaks are classified by their intended use. There are six primary classifications: slalom, whitewater, surf, touring/expedition, light touring/day tripping and general recreation. From these primary classifications stem many sub-classes. For example, a fishing kayak is simply a general recreation kayak outfitted with features and accessories that make it an easier kayak from which to fish. Also within these classifications are many levels of performance which further separate the individual models. In other words, not all touring kayaks handle the same.

There are two major configurations of kayaks - "sit on tops" which as the name suggests involves sitting on top of the kayak in an open area and "cockpit style" which involves sitting with the legs and hips inside the kayak hull and a "spray skirt" that creates a watertight barrier around the waist. Whether a kayak is a sit-on-top or a cockpit style has nothing to do with which classification it falls under. Both configurations are represented in each of the five primary classifications. While most kayaks are designed to be paddled by a single person, other configurations include tandem and even triple cockpit boats.

Because of their range and adaptability, Kayaking is popular amongst divers, fishers, and adventure enthusiasts.