Canning equipment includes jars, which are four-letter containers used to store food that has been preserved through the canning process. Canning is a method of preserving food in which the food is placed in jars or cans and heated to a temperature that destroys microorganisms that cause spoilage. The jars are then sealed to prevent air from entering and spoiling the food. Canning equipment also includes lids, rings, and other tools used to seal the jars.