A key switch is the physical and electronic mechanism that supports the keys and registers the keystroke. Keyboard fans argue endlessly about which switch design is best. Most people don't need to dig into the nitty-gritty, but a basic understanding is useful if you're serious about buying an excellent keyboard. The membrane switch is the least expensive. Each key sits on a rubber membrane, typically shaped like a dome, which provides resistance and keeps keys elevated. The dome collapses when you press a key, forcing the bottom into contact with the circuit board beneath. Membrane switches have a mushy feel that some find annoying. They respond slowly to rapid, repetitive input, which is bad news for gamers. Membrane switches are reliable and hold up well to drops, spills, and general abuse. Scissor switches are found in many premium keyboards and laptops. The switch is shaped like a pair of scissors with the blades open. The blades separate further when you press the key, creating tension and resistance in the switch. Scissor switches have a shallow, crisp action that many people find pleasant to use but lack the chunky feel mechanical switches provide. The shallow design of a scissor switch allows for a thinner keyboard, which some people find more comfortable. You'll prefer a scissor switch if you want an attractive keyboard that's enjoyable to use all day. Mechanical switches are their own sub-genre. They all use a mechanical element (typically a spring) for resistance, and this makes them thicker than the alternatives. Mechanical switches have a reputation for a loud, chunky, tactile feel, but this is only true of keyboards that label themselves as "clicky." You'll also find keyboards advertised as "tactile." These have an actuation point you can feel while pressing the key but aren't designed to make noise.  We don't currently include any mechanical switch keyboards among our best keyboard recommendations, but our guide to the best mechanical keyboards offers options for mechanical keyboard fans.