I think there's not much big difference with bitcoin and real money. As what others saying, they are both currencies where we can both use in purchasing goods and services. The only difference maybe is that bitcoin continues to increase its value.

Here's an example. If you have one dollar today, you can buy 10pcs of candies. Five years later, due to unstoppable price increase in commodities, your one dollar may only buy 7 candies after five years. Compare it now to bitcoin. Lets say you have 1 dollar worth of bitcoin today of which you can still buy 10 candies. But five years later, since the price of bitcoin continue to increase, then after five years, your one dollar worth of btc may purchase 13 candies or more..

Hope i made it clear though.