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Anti-spyware software is a type of compture program designed to prevent and detect unwanted spyware program installations and to remove those programs if installed.
Anti-virus software is software used to prevent, detect, and remove malware, including computer viruses, worms, and trojan horses. Such programs may also prevent and remove adware, spyware, and other forms of malware.
A firewall is a computer software that is designed to block unauthorized access while permitting authorized communications.