What do I set my multimeter to for 12V?

Excuse me, could you please clarify something for me? I'm a bit confused about setting my multimeter for 12V. What exactly should I set it to in order to accurately measure a 12-volt source? I'm not sure if I should be using the DC or AC setting, or if there's a specific voltage range I should select. Could you guide me through the process, please? Thank you very much for your help.