Crackers

A cracker is a flat, dry baked food typically made with flour. Flavorings or seasonings, such as salt, herbs, seeds, or cheese, may be added to the dough or sprinkled on top before baking. Crackers are often branded as a nutritious and convenient way to consume a staple food or cereal grain.
Reproduction of 19th-century hardtack, in the Army (square) and Navy (round) styles
Crackers can be eaten on their own, but can also accompany other food items such as cheese or meat slices, dips, or soft spreads such as jam, butter, or peanut butter. Bland or mild crackers are sometimes used as a palate cleanser in food product testing or flavor testing, between samples. Crackers may also be crumbled and added to soup.
The modern cracker is somewhat similar to nautical ship’s biscuits, military hardtack, chacknels,^[4] and sacramental bread. Other early versions of the cracker can be found in ancient flatbreads, such as lavash, pita, matzo, flatbrød, and crisp bread. Asian analogues include papadum and senbei.