What are the key differences between a mash tun and a lauter tun in the brewing process?

The key difference between a MASH tun and a lauter tun in the brewing process is their primary function. A mash tun is used for mixing crushed grains with hot water to convert starches into sugars, while a lauter tun is used for separating the liquid wort from the solid grain husks after the mashing process.