Das Auto des Mannes ist neu.
English: The man's car is new.
The Genitiv is a German case used to show possession or relationships between nouns. It often answers the question 'whose?'.
Use the Genitiv to show that something belongs to someone or something, after certain prepositions (like während, trotz, wegen, statt), and in some fixed expressions.
Das Auto des Mannes ist neu.
English: The man's car is new.
Die Farbe des Hauses ist blau.
English: The color of the house is blue.
Während des Urlaubs haben wir viel gesehen.
English: During the vacation we saw a lot.
Trotz des Regens gehen wir spazieren.
English: Despite the rain we go for a walk.