Bitcoin is a cyrptocurrency. In the future the bitcoin has our own ATM...and Bitcoin is very popular in very country of the whole world for daily shopping etc...Bitcoin is digital and decentralized With Bitcoin people get the liberty to exchange value without intermediaries which translate to greater control of funds and lower fees. Its faster, cheaper, more secure and immutable. Cash is controlled by banks while bitcoin has owners.
Bitcoin is better than cash and the reason behind it is varying rate of bitcoin like if you have bitcoin and the rate of bitcoin is increased then your bitcoin will also be increased but if you have a cash in your wallet then it will be fix and also risky because anyone can stolen it from you.