What is keypad with letters and numbers?

A keypad with letters and numbers is a device that consists of a panel with buttons for both numbers and letters. It is used as an input device for various electronic gadgets, such as computers, mobile phones, and other appliances. The keypad typically has the standard layout with numbers, but it also includes alphabetical characters, punctuation, and special symbols. They can be of different sizes and designs but can be accessed by pressing a combination of keys. It is commonly used for typing messages, passwords, and entering commands into electronic devices. Some keypads also have backlights to assist users in the dark or low light environments.