The difference between ski and sled

Ski, as the name suggests, is a board. Can a can two. Can take stick to also can not take.
Must be from a high place to a low place. Uphill can only carry it away.
The sledge is to haveplastic garden rakes, can be a person, also can be the animal. But to say that it is usually slippery slide on the ground.
Snowboarding is generally divided into Alpine board, cross-country winter two plate, plate, plate, free diving board etc.. Alpine board is composed of multi-layer structure, including elastic material, engage in torsion than in previous years, box shaped structure, core board, glass fiber composite materials, polymer materials, metal plate edge etc..
The portable snow shovelIs it right? Uphill to sled cannot! The sledge belong to animal or person pulls to move.