They are so named because of the type of technology used in the keys to activate them: Two plastic films that contain a circuit which maps all the different keys. Membrane keyboards (also sometimes known as rubber dome switches) are the most commonly found and used keyboards today, and they come in many different shapes and sizes. Today, most people differentiate keyboards among three different types based on their type of keys: membrane keyboard, mechanical keyboard, and the laptop keyboard, or also known as the scissor switch keyboard. However, keyboards such as those are rather rare and uncommon in use these days, although they are still widely available for purchase if someone would wish so. There are actually a lot of different types of keyboards out there, including ergonomic ones which may look rather strange, but actually help to reduce wrist and finger strain during long typing sessions. The QWERTZ is widely used in Germany where the "Z" replaces the "Y" key in the QWERTY layout. Other lesser known layouts include QWERTZ and Dvorak Simplified Keyboard, which is rather uncommon in most parts of the world. They keyboard's layout may vary in different regions, and the most commonly used one is the QWERTY keyboard, which is the one commonly seen all over the world, with the layout of some regions different slightly in the placement of certain keys such as the "bar" key (commonly found above the "Enter" key), which could be placed next to the "Backspace" key instead. Functions like this gives the keyboard more functions than the original number of keys do. Most often, pressing several different keys simultaneously or in sequence may also result in a secondary function of the key being activated, such as the quotation mark which may give a single quotation symbol or a double quotation symbol. Each key has a representing letter, numeric, or symbol printed or engraved (in many different ways) on to the key for user reference. The typical keyboard has a up to 104 keys as a standard, but this may vary in different types and layouts of keyboard, each one representing an alphabetical letter, numeric, symbol, function, and directional key. The computer keyboard is the most basic way to navigate through a computer, even from the most basic of interfaces such as the BIOS settings where the computer mouse is not recognized and thus the keyboard has become the main input for computers. The computer keyboard is probably the most important piece of computer peripheral or accessory you must have.
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