A mandoline is a slicing tool that includes a handguard to hold food steady while slicing it very thinly and evenly.
A mandoline is a kitchen tool primarily used for slicing fruits and vegetables into thin, uniform slices. Its key feature is a sharp blade set into a flat surface, often adjustable for different slice thicknesses. The most important part for safety and stability is the handguard or food holder. This device securely grips the food item, keeping your fingers away from the blade while allowing you to slide the food across the blade for consistent, thin slices. Without a handguard, achieving very thin and even slices safely would be extremely difficult and risky. Mandolines are particularly useful for tasks like making potato chips, vegetable gratins, or preparing ingredients for salads where uniform size and thinness are desired.
Always use the handguard that comes with your mandoline, even if you feel confident. A momentary lapse in concentration can lead to a serious cut. Never try to slice the last small piece of food without the guard; discard it instead.