On/Off Cookers
Cook and turn off - The rice cooks and the unit shuts off automatically.
Cook and keep warm - The rice cooks, reduces the heat when the rice is done then maintains it at a "warm" temperature (duration varies).
Electronic Cook and Keep Warm - A sensor in the unit keeps rice warm for up to 12 hours.
Fuzzy Logic Cookers
Basic Fuzzy Logic - A very sophisticated machine with some great features like settings for soup or porridge, brown rice, rice texture (hard or soft) and even a sushi rice setting.
Induction Heating - The most state of the art machine available. The induction system can actually compensate for you measuring errors and still deliver evenly, properly cooked rice.