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Caps Lock is a keyboard key that, when pressed, changes the default letter case of typing to uppercase, making all subsequent letters typed appear in capitals. It's a "toggle" key, meaning another press deactivates the function and returns typing to lowercase, and it often has an indicator light to show its status. The Caps Lock key was created to make it easier to type in all uppercase without having to hold down the Shift key constantly, though using it for extended messages is often perceived as shouting.

How it Works

Activation: Press the Caps Lock key once.

Indicator: A light on the keyboard will typically turn on to signal that Caps Lock is active.

Typing: All letters you type will now appear in uppercase.

Deactivation: Press the Caps Lock key again, and the indicator light will turn off, returning the keyboard to lowercase.

Purpose and Usage

Convenience: It allows for typing in all caps without holding down the Shift key for every letter.

Communication: While it can be used for emphasis or to fulfill technical requirements, using all caps for long passages can be perceived as aggressive or equivalent to shouting online.

History: The key is a descendant of the "shift lock" found on mechanical typewriters.