Kann jemand den Unterschied zwischen den beiden kurz erklären?
Sagt man "Das Auto dreht" oder "Das Auto dreht sich". Gibt es einen Unterschied?
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Does the car simply make a U-turn?
Is it skidding and the driver has lost control?
"drehen" is just a generic "to rotate something". Note that in German you cannot just "drehen". You always need something you're rotating, either something else or yourself.
"Umdrehen", is more specific. The "um" pretty much implies a 180° rotation so "umdrehen" is "to turn around". It can mean that you turn your head to look behind you, it can mean that you turn your hand upside down or it can mean that you have to go back home because you forgot your plane ticket on the desk.
"drehen" = at any arbitrary angle (in any which direction) "umdrehen" = at exactly 180° (flipped side)
Sie drehte die Spielkarte auf dem Tisch. - She rotated the playing card on the table. Sie drehte die Spielkarte auf dem Tisch um. - She flipped the playing card on the table over.