1) Spamming: Spamming denotes distribution of unsolicited e-mails in large numbers. They are meaningless and they unnecessarily block the whole system. These activities are treated as illegal.
2) Theft of personal details While using the Internet there is high probability that your personal details like name address and credit card number may be accessed by con artists and used for fraudulent purposes.
3) Pornography: Pornography is definitely harmful for your children. There are numerous pornographic sites available over the Internet and watching any of those can have very bad influence on the mental health of your children.
4) Virus threat Virus is a program that interrupts the usual operation of your personal computer system.