Does a flashlight use direct current?

Could you please clarify for me if a flashlight operates using direct current? I'm interested in understanding the electrical principles behind its functionality. Specifically, does the power source within a flashlight, such as batteries, supply direct current to the light-emitting diode or bulb, enabling it to illuminate? I'm seeking a concise explanation that can help me grasp the fundamental difference between direct and alternating current in this context.