How long have crackers been around? What is the history of the cracker?

[Mister Obvious]

Hardtack (or hard tack) is a simple type of biscuit or cracker, made from flour, water, and sometimes salt. Hardtack is inexpensive and long-lasting. It is used for sustenance in the absence of perishable foods, commonly during long sea voyages, land migrations, and military campaigns.

https://en.wikipedia.org/wiki/Hardtack