What are the differences between water bath canning and pressure canning methods for preserving food?

Water bath canning and pressure canning are two methods used to preserve food. Water bath canning is suitable for high-acid foods like fruits and pickles, while pressure canning is necessary for low-acid foods like vegetables and meats. Water bath canning uses boiling water to create a seal, while pressure canning uses high pressure to kill bacteria. Pressure canning is more effective at preserving a wider range of foods and ensuring safety.