Preservation
Japanese: 保存
The collective term for techniques that maintain food quality and safety. Fermentation is one of the earliest preservation technologies discovered by humanity.
Preservation is the technology of maintaining food quality and safety against the passage of time. Drying, salting, smoking, freezing—many methods exist, but fermentation is among the oldest.
Fermented foods last for multiple reasons. Organic acids from lactic acid bacteria lower pH, salt sorts microbes through osmotic pressure, and alcohol has antimicrobial effects. These factors work together to suppress spoilage.
Miso can keep for years because salt and organic acids provide a double layer of protection. Preservation isn't about stopping time—it's about coexisting with it.