Popcorn makers feature different technologies, but key characteristics include air popping or oil-based popping, built-in stirrers, temperature control/timers for convenience and safety, ease of cleaning with removable or non-stick parts, durable construction from materials like stainless steel, and safety features such as heat insulation and anti-scald designs. Some models also offer extra convenience with features like integrated butter melting trays or auto-popup mechanisms to guide popcorn into a bowl.