
der Fahrer
driver
A person who operates a vehicle such as a car, bus, truck, or train.
Der Fahrer des Wagens hat die Vorfahrt missachtet.
The driver of the car failed to yield the right of way.
driver
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driver
A person who operates a vehicle such as a car, bus, truck, or train.
Der Fahrer des Wagens hat die Vorfahrt missachtet.
The driver of the car failed to yield the right of way.

rider
A person who rides a two-wheeled vehicle such as a bicycle or motorcycle.
Der Fahrer an der Spitze des Feldes trägt das gelbe Trikot.
The rider at the front of the field is wearing the yellow jersey.
'Der Fahrer' (the driver/rider) is derived from the verb 'fahren' (to drive/ride) by adding the ending '-er'. This pattern is used very frequently in German to refer to a person who performs a particular activity.
Wer fährt dieses Auto? Ich möchte mit dem Fahrer sprechen.
Who is driving this car? I would like to speak to the driver.
The word 'Fahrer' is often the second part of compound nouns, used to specify the type of driver or rider. Typical examples are 'LKW-Fahrer' (truck driver), 'Busfahrer' (bus driver), 'Taxifahrer' (taxi driver), or 'Radfahrer' (cyclist).
Der LKW-Fahrer musste eine lange Pause machen.
The truck driver had to take a long break.
Whether 'Fahrer' means a person at the wheel of a car or on a bicycle is always clear from the context. The vehicle mentioned (e.g., car, bus, motorcycle) determines the exact meaning.
Der Fahrer des Motorrads trug einen Helm.
The rider of the motorcycle was wearing a helmet.
driver
Fahrer and Autofahrer can both refer to a person who operates a vehicle. Fahrer is the more general term and can also refer to people driving buses, trucks, or trains; Autofahrer specifically means a person at the wheel of a car. Use Autofahrer when the type of vehicle is important.

Der Fahrer wartete mit dem Fahrzeug vor dem Eingang.
The driver waited with the vehicle in front of the entrance.
Der Autofahrer wartete mit seinem Auto vor dem Eingang.
The driver waited with his car in front of the entrance.