The main difference between process manufacturing and discrete manufacturing is that process manufacturing produces a mix of ingredients that cannot be distinguished from each other, whereas discrete manufacturing produces distinct objects.
There are two main types of process manufacturing: batch or continuous. Batch processing involves production based on a predetermined standard of size or length. Continuous processing is based on production runs that go for certain time periods with dynamic output volumes.
Any industry that produces large or bulk quantities of goods and products would rely on process manufacturing. A few examples of industries that use process manufacturing would include chemical suppliers, food and beverage, bulk nutrition and pharmaceuticals.