Cheddar is a type of hard yellow cheese, originally made in Britain. a firm smooth yellow cheese (Cheddar village in Somerset, southwest England, where the cheese was first made)
In cheese making it is the process of cutting and pressing cheese to remove the whey and leave drier curds. Originally it referred to a manual process, but now it is also used to describe the mechanical manufacture. Cheese produced using this process is typically called Cheddar