The primary purpose of a ductless hood is to vent your kitchen and eliminate the fumes that are caused by regular cooking, steam, smoke, and flame. By doing this, hoods also help to remove and catch grapes so that they do not build up on your cabinets and appliances.
Contrary to a ducted hood, which pushes the air outwards, the ductless hood consists of a fan (or a blower, motor) with a charcoal filter that sucks up bits of fat, flame, smells and smoke. Ductless hoods normally have vent hoods second to duct hoods and commonly clean air more efficiently, but duct hoods can be cost-effective if ducts do not yet exist in your kitchen.
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Ductless hoods in the kitchen do not have a ventilation vent. The air is then filtered into the room and used by strong air filtration. Usually, use in houses.
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To conclude: a ductless hood is better than no range hood in the series, but it will never give you the same value as a ducted hood.