As computer viruses, spyware and other malicious electronic activities have become more commonplace, many types of computer security tools have been developed to protect systems from unwanted intrusions. Computer users can choose from firewalls, antivirus software and spyware blockers to help find and eliminate harmful code. Concerned users also may wish to use online password generation and retrieval services or authenticators to help protect online accounts from being compromised. Many businesses require a higher level of security for sensitive data and may hire a staff of electronic security professionals or bring in consultants to help install and maintain a secure network.

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