What is cookie?
Non Technical
It’s very difficult to find good examples in the real world that can describe the cookies with appropriately. But let's try this one: A doctor will give you a card that will be filled on your circumstances when you first came for a treatment to him and handed the card to you. Every time you come (which may still be associated with the same disease) you submit the card and the doctor can know your progress, and can know you came because of what (for the disease earlier, or because of new diseases). If the doctor is a web server and the patient is a client (browser), then the card is a cookie that will be discussed at this time.