Most cameras use dedicated rechargeable lithium-ion cells, but some accessories like external flashguns, battery grips and hotshoe mounted LEd panels use regular AA cells instead.
Battery types, tips and technologies
Digital cameras are obviously heavily reliant on batteries, but many photo accessories like flashguns, LED panels, battery grips and gimbals use them too. Here's a set of articles about batteries. Photo by Nick Dietrich on Unsplash
These are used rarely in digital cameras (except in some cheap point and shoot models) but used extensively in external flashguns and battery grips. Alkaline AAs will do in an emergency, but rechargeable NiMH batteries are more cost effective and last longer between charges.