1) Are you used Bitcoin to buy illegal staff 
2) which better to buy legal things Bitcoin or Normal Bank system (PP,payeer,cash ,.............)
Bitcoin can be used to buy things electronically. In that sense, its like conventional dollars, euros, or yen, which are also traded digitally.However, bitcoins most important characteristic, and the thing that makes it different to conventional money, is that it is decentralized.2) which better to buy legal things Bitcoin or Normal Bank system (PP,payeer,cash ,.............)