Why do numbers come up when you type letters?

When you type letters on a keyboard, numbers may appear due to the use of a feature called "Num Lock" or specific keyboard shortcuts. For example, on some devices, holding down the "Shift" key while pressing a number key will produce the corresponding symbol. Additionally, certain applications or contexts may interpret letters as commands or variables that can be associated with numerical values. If you're experiencing unexpected behavior, it might also be a result of keyboard settings or configurations in your operating system.