This is the 879th most frequent German word.
kauf
"Purchase" or "buy."
The verb 'kaufe' (buy) is conjugated to 'kaufte' in past tense.
Er kaufte ein neues Auto.
He bought a new car.
The noun 'Kauf' is used to evaluate the quality of the purchase made.
Ist das ein guter Kauf?
Is that a good purchase?
The noun 'Kauf' is used here to denote a transaction of buying something.