Jason Bradwell's 365/366 Photo a Day Blog

Canning is a method of preserving food in which the food is processed and sealed in an airtight container. The process was first developed as a French military discovery in 1809. The packaging prevents microorganisms from entering and proliferating inside.

To prevent the food from being spoiled before and during containment, quite a number of methods are used: pasteurization, boiling, refrigeration, outright freezing, drying, vacuum treatment, antimicrobial agents that are natural to the indigenous recipe, a sufficient dose of ionizing radiation, submersion in a strongly saline, acid, base, osmotically extreme or otherwise microbially challenging environments.