Pepper jack cheese is a variant of Monterey Jack cheese. Pepper jack cheese is a semi-soft cheese with an open texture and spicy flavor from the sweet peppers, rosemary, habañero chilies, garlic, and spicy jalapeños studded in the cheese. Pepper jack melts easily, thanks to high moisture content.
Jack cheeses are variants of Monterey Jack cheese, a cheese first made by Franciscan friars in the Monterey area of California. A Monterey businessman named David Jacks was one of the first to sell the cheese widely in the late 1800s, and the cheese eventually came to be called by his name.