In this busy life we spent our time with internet. Which is a platform of learn & makes life easy. But some criminal minded people commited crime in cyber space. The grate issue is cheating in online. Criminals destroy your life through blackmailing, hacking, cheating, taking money, etc. Some time criminals may caught, some times may not be. You have to be careful about your data. The main porous is to protect you through procting your data. Don't go to dark site. Use fire wall. Anti virous. Dont use hack application,don't click spam sms or mail link, which can take your money, from you, blackmail you. Many big big company spent money to protect their website. Many ethical hacker is employed to protect your personal documents.