A Sayona deep fryer is a kitchen appliance designed for deep frying food submerged in hot oil. It's available in various models, including those with single or dual baskets, and capacities ranging from 1.5L to 6.5L. Key features often include stainless steel housing, adjustable thermostats with light indicators, cool-touch handles, removable oil containers, and immersed heating elements. Some models also feature timers, windows, and filters.