All it does, really, is dispense hot and cold water. But with so many variations on that theme, it's really surprising. Based on this article from Houzz, here's some information, tips and ideas to help you find the faucet for your new or existing kitchen.
Sink mount - Sinks have anywhere from one to four holes to accommodate different faucet sets, so if you're replacing an existing faucet, this may limit your options. Some faucets come with extra plates to cover any holes that are not used.
Deck mount - This faucet category mounts in the counter next to the sink rather than the sink itself. This is a common mounting style for undermount sinks. It also offers a lot of options from classic to contemporary. Because they're mounted on the countertop, they can be a collection zone for dirt and other watery gunk, so make sure the install leaves enough room to clean around it.
Wall mount - Why not get it up off the counter entirely and onto the wall? Well, installation may be more difficult, and pipes may freeze in winter because they're closer to an outside wall. You'll have to watch distances, as the faucet spout may not reach your sink properly.
Double handle - The older of the two designs: one tap for hot, one for cold. Because it's been around longer, there are more options. Less convenient in some ways than single handled faucets, but they do seem to offer better temperature control, and if one tap leaks, you can often shut off its supply to work on it while still using the other.
Single handle - Controls flow and temperature with one handle. Clean installation, and often comes with high arching spouts for getting larger items underneath. Very convenient at times, but adjusting the temperature may be a bit more finicky for some than on a double handle faucet.
Hands-free - the new kid on the block. Turn the water on with just a light touch or a wave. Great for those who have trouble using taps, and they shut off automatically when you're done or the sink's full. You still can't control flow or temperature, though, and guess what? You'll need to replace the battery occasionally.
Lots of options here, from traditional chrome and nickel to brass or bronze, black or white. (You can drop by our showroom to see some in person.) Consider picking up any accessories from the same manufacturer at the same time, as other makers may not have an exact match.
Contemporary or classic, if your kitchen has an established style, or you have one in mind for your renovation, this will do more than anything else in determining your faucet style. Sometimes, though, it happens in reverse, where you become infatuated with a particular type or style of faucet, which in turn determines the kitchen's style. Best to talk with a designer if you're unsure.
Like bathroom faucets, the inner mechanics and overall construction will determine quality and durability. Ceramic disk is more durable than rubber. Stainless steel and brass outlasts plastic. Expect to pay more for quality, but in the long run you may need to repair or replace it less often.
Need more advice on kitchen faucets? Get in touch with us, or drop by our showroom. It's your Access.