Swiss cheese is a type of cheese that is known for its holes, or 'eyes'. It is made from cow's milk and is usually aged for several months. Gruyere, Emmental, Emmenthal, Sapsago, Tilsit, Fromage, and Emmentaler are all types of Swiss cheese. Gruyere is a hard yellow cheese with a nutty flavor, Emmental is a mild yellow cheese with a slightly sweet taste, Emmenthal is a semi-hard cheese with a nutty flavor, Sapsago is a green cheese with a mild flavor, Tilsit is a semi-hard cheese with a mild flavor, Fromage is a soft cheese with a creamy texture, and Emmentaler is a semi-hard cheese with a nutty flavor.