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A keypad is a set of buttons or keys arranged in a block or “pad” which bear digits, symbols or alphabetical letters. They are found on many devices including telephones, calculators, remote controls, door locks, and ATMs, among others. Keypads are widely used in various types of devices for a variety of applications.

In computing, a keypad is a part of the keyboard, and it contains keys that have numbers and arithmetic operators (add, subtract, multiply, divide), and it’s also known as a numeric keypad. This type of keypad is commonly used for data entry jobs because it allows for fast and efficient input of numerical data.

The design of a keypad can vary greatly depending on the device it’s used on. For example, a telephone keypad has digits from 1 to 9 arranged in three rows of three digits each, with 0, * and # below. On the other hand, a computer’s numeric keypad typically has numbers 0-9, arithmetic operations (+, -, *, /), decimal point, and a few function keys.

Keypads can also be used for security purposes. Many security systems require a person to enter a code on a keypad to gain access to a certain area or to deactivate an alarm. In such systems, the keypad will often have additional features for security, such as keys that light up for night use or keys that are specially coated to resist wear from repeated use.

In summary, a keypad is a set of buttons arranged in a block, which is used as a method for inputting data into a device. It can be used for a variety of applications including computing, telecommunication, and security.

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