What is the difference between communicable and noncommunicable diseases?

The difference is surprisingly huge...

a non-communicable disease is usually a medical condition or disease that is not infectious. Meaning, you cannot catch it. For example; cancer, asthma, chronic lung disease, diabetes, and many others.

communicable diseases are the complete opposite, it's majorly infectious meaning you CAN positively catch it. 

Hope this helps! 

This is true. yes. indeed.

Think it's rice because in many countries rice is the main food so it can be traditionally served all at once.