When Caps Lock is enabled, your keyboard types in uppercase letters by default. Caps Lock is a key located on the left side of your keyboard, usually the third key from the bottom. It is labeled "Caps Lock" or marked with an arrow and a small square underneath. On some computers, a light indicates when it is activated, while on others, you may need to check by typing in a document, such as in Word. You can toggle it on and off by simply pressing the key.