die Automatik
automatic transmission
The automatic transmission in a vehicle, which changes gears on its own.
Im Stadtverkehr ist ein Auto mit Automatik viel bequemer.
In city traffic, a car with an automatic transmission is much more comfortable.

automatic / automatic transmission
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automatic transmission
The automatic transmission in a vehicle, which changes gears on its own.
Im Stadtverkehr ist ein Auto mit Automatik viel bequemer.
In city traffic, a car with an automatic transmission is much more comfortable.

The noun 'die Automatik' (automatic system/automatic transmission) belongs to the word family of 'automatisch' (automatic). Both words describe something that works by itself or without human intervention.
Die Tür öffnet sich automatisch, wenn man sich nähert.
The door opens automatically when you approach.
You can tell from the context whether 'Automatik' means the automatic transmission of a car or a general technical system. In conversations about cars, traffic, or driving, 'Automatik' almost always refers to the transmission.
Mein nächstes Auto soll auf jeden Fall eine Automatik haben.
My next car should definitely have an automatic transmission.
In connection with cars, 'Automatik' is often used with the preposition 'mit' (with) or as the direct object of the verb 'fahren' (to drive).
Ich suche ein gebrauchtes Auto mit Automatik.
I'm looking for a used car with an automatic transmission.
regulation / control
'die Regelung' and 'die Automatik' can both have to do with controlling a technical process. 'Regelung' describes more the process of setting or adjusting something so that a certain state is achieved or maintained. 'Automatik' refers more to the system or device that does something independently. The words can be confused because both appear in technical contexts. When you are talking about the process of control, 'Regelung' fits. When you mean that a device works without intervention, 'Automatik' is more natural.

Die Automatik schaltet das Licht ein, sobald jemand den Raum betritt.
The automatic system turns on the light as soon as someone enters the room.
Die Regelung der Heizung sorgt dafür, dass die Temperatur gleich bleibt.
The control of the heating system ensures that the temperature stays the same.