Why can some foods be kept longer than others?

Some foods can be kept longer than others due to factors such as moisture content, pH level, and the presence of preservatives. Foods low in moisture, like dried grains or jerky, are less prone to microbial growth, while acidic foods, like pickles, inhibit bacteria. Additionally, foods that contain preservatives or are packaged in airtight containers have extended shelf lives. These characteristics influence how quickly food can spoil and its overall longevity.