die Karosserie
vehicle body
The outer structure of a vehicle, especially a car, that encloses the chassis, engine, and interior.
Nach dem Unfall hatte die Karosserie eine große Delle.
After the accident, the body had a large dent.

body
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vehicle body
The outer structure of a vehicle, especially a car, that encloses the chassis, engine, and interior.
Nach dem Unfall hatte die Karosserie eine große Delle.
After the accident, the body had a large dent.

'Karosserie' (body) is a specific technical term used almost exclusively in the context of vehicles such as cars, buses, or trains. It refers to the outer shell of the vehicle.
Die Karosserie dieses Oldtimers ist noch original.
The body of this vintage car is still original.
People often talk about damage to the body. Typical collocations are 'eine Delle in der Karosserie haben' (to have a dent in the body) or 'einen Kratzer an der Karosserie reparieren' (to repair a scratch on the body).
Ein Fahrradfahrer hat einen langen Kratzer in der Karosserie hinterlassen.
A cyclist left a long scratch in the body.
In connection with repairs, the verbs 'ausbeulen' (to remove dents), 'lackieren' (to paint), and 'polieren' (to polish) are often used.
Die Werkstatt muss die beschädigte Karosserie erst ausbeulen und dann neu lackieren.
The repair shop first has to remove the dents from the damaged body and then repaint it.
frame
'der Rahmen' and 'die Karosserie' can both refer to something outer or surrounding. Even so, they belong to different areas. A 'Rahmen' is generally a frame, for example for a picture, a window, or a door. 'Karosserie' is used only for vehicles, especially cars, and refers to the outer structure of the vehicle. The words can be confusing because both can enclose something. But when you are talking about a car, 'Karosserie' is the precise word for its outer shape and body.

Nach dem Unfall hatte die Karosserie des Autos mehrere tiefe Kratzer.
After the accident, the body of the car had several deep scratches.
Der alte Rahmen des Fensters muss vor dem Winter repariert werden.
The old frame of the window needs to be repaired before winter.