2.  A computer virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. It is deliberately designed to interfere with your computer.

3.  Phishing is a fraud attempt, usually made through email, to steal your personal information. Phishing is an attempt to get information such as usernames, passwords, and credit card details and sometimes money

4. popup blocker is a efficiency that prevents Web site popups from displaying. The challenge with this software is to dispose a valid popup from an advertisement.

5.  firewall is software or hardware that checks information coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer, depending on your firewall settings. firewall can help prevent hackers or bad software (such as worms) from gaining access to your computer through a network or the Internet.

6.  Email spam targets individual users with direct mail messages. Email spam lists are often created by scanning Usenet postings, stealing Internet mailing lists, or searching the Web for addresses.

7.  Hacking is modifying the features of a system, in order to succeed a purpose outside of the creator's original plan, hackers usually hack just for a challenge and to see if they can succeed into getting in to your computer and data

8.  Antivirus software is a computer program that detects a virus or others such as Trojans and takes action to disarm or remove the bad software programs such as viruses and worms. they are specifically designed to remove viruses from your computer

9.  Effective Protection will help protect against your computer being infected with viruses and spyware that could result from your online activities that seem completely harmless – such as searching the internet, downloading, playing games and even using email. it will safeguard you against things such as fraud and identity theft.

10.  Identity theft is a type of theft where you steal someone's identity and that person pretends to be someone else by assuming that person's identity, usually as a method to gain access to resources or obtain credit and other benefits in that person's name.