Internet opens a door for your computer to experience the world. Through this door you can simply go for online shopping, read the latest news, send e-mail, and many more. But this open door is also opens a window for hackers to easily get entrée to your PC.
Ones hacker enters your PC he can steal your important private data, such as account number and passwords of Credit card. Your computer can be used devoid of your knowledge to commence attacks on other computers, even on entire networks. A hacker can leave your computer only when hacker wishes.