🟢 easywhat am-i

I am taken from a mine, and shut up in a wooden case, from which I am never released, and yet I've been used by almost everybody. What am I?

Common Wrong Answers

Gold

Gold is indeed taken from a mine, but it is not typically encased in wood for general use, and not everyone uses gold daily.

Diamonds

Diamonds are mined but are not found in wooden cases for everyday use; they are generally used in jewelry or industrial applications.

Coal

Coal is mined and used by many, but it is not encased in wood and does not fit the description of being used by almost everybody.