Why are computer keyboard keys printed in Uppercase? [duplicate]

1. Why are my keys capitalized?
2. Which key makes all letters capital until you press it again?

Why are my keys capitalized?

At times, the shift or caps lock key may become stuck internally on the keyboard, or the simple control processor in the keyboard may start having problems, resulting in strange behavior including all-caps typing. If available, connect a different keyboard and see if problems continue.

Which key makes all letters capital until you press it again?

The 'caps lock' key allows you to write in capital letters. To turn it on, press it once and type. To turn it off, press it again.