Simplify the following text for a Grade 11 native English-speaking person.
Original: The Deutsche Mark ( , German mark ) was the official currency of West Germany ( 1948 â `` 1990 ) and Germany ( 1990 â `` 2002 ) until the adoption of the euro in 2002 .
Simplified: The Deutsche Mark ( DM ) was the official currency of West Germany ( 1948 â `` 1990 ) and Germany ( 1990 â `` 2002 ) until the adoption of the euro in 2002 .