Mueller Pro-Series 10-in-1 Vegetable Chopper.

Chopping and Dicing: For vegetables like onions, carrots, and potatoes.
Slicing and Julienne: Creating thin slices or matchstick-shaped pieces.
Grating and Shredding: For cheese or other ingredients.
Egg Slicing: Some models also include an egg slicer

The "10-in-1" designation refers to the multiple functions and blade types it offers within a single compact unit. It often comes with a container to collect the chopped or sliced food.