Countertop MicrowaveWhat it is: These are the traditional, everyday, what-you-grew-up-with sort of microwaves, intended to sit on the countertop and plug right in. You can also use these as built-in units by adding a trim kit. Variations: Dozens of options for wattage, size and finish are available. There doesn't seem to be much standardization with this appliance. When to use: I like to put countertop microwaves in niches, on shelves with cookbooks or hidden away behind a pocket door or pantry door. I rarely put a countertop microwave on the actual counter.