Hello Customer (name blocked for privacy), as a Nutritionist and a Physician, my natural tendency to answer this question in painfully minute detail but I'm not sure if thats what you would like / need. I have linked to 2 good sites that I feel do a quality job describing the digestive process.
Wikipedia - Digestion
Your Digestion - How it works
Your satisfaction is my ultimate goal, if I can add any information to improve your satisfaction, please feel free to let me know.