What is a common technique used for preserving food?

Canning is a common technique used for preserving food because it involves sealing food in airtight containers and heating them to kill bacteria, yeasts, and molds that can cause spoilage. This process not only extends the shelf life of the food but also helps maintain its nutrient content and flavor.

By removing air and sealing the food in jars or cans, canning reduces the risk of oxidation and contamination, making it a safe method for long-term storage. This technique is widely used for fruits, vegetables, meats, and soups, allowing them to be stored for months or even years without refrigeration.

While smoking is also a method of preservation, it is primarily used to enhance flavor and is not as efficient as canning in preventing spoilage. Grilling and frying are cooking methods rather than preservation techniques, as they typically do not extend the shelf life of food.