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答A computer virus is a type of malicious software that can replicate itself and spread from one computer to another. It is designed to disrupt computer operations, gather personal information, or gain unauthorized access to systems.Computer viruses can be spread through various means, such as email attachments, infected websites, or file downloads. Once a computer is infected, the virus can perform a variety of harmful actions, such as deleting files, corrupting data, or slowing down the system.There are different types of computer viruses, including:1. File infectors: These viruses attach themselves to executable files and spread when the infected file is executed.2. Macro viruses: These viruses infect documents that contain macros, such as Word or Excel files, and can spread when the document is opened.3. Boot sector viruses: These viruses infect the boot sector of a computer's hard drive or floppy disk and are activated when the computer is started.4. Worms: Worms are self-replicating viruses that can spread over a network without any user intervention. They can exploit vulnerabilities in computer systems to gain access and spread to other computers.5. Trojan horses: Trojan horses are disguised as legitimate software or files, but once executed, they perform malicious actions, such as stealing personal information or giving remote access to hackers.To protect against computer viruses, it is important to have up-to-date antivirus software installed on your computer and to regularly update your operating system and software. Additionally, it is important to exercise caution when opening email attachments, downloading files from the internet, and visiting unfamiliar websites.

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