A computer virus is a harmful program or piece of code that can damage files, slow down the computer, and interfere with normal working.
Viruses usually enter a computer through infected files, downloads, email attachments, USB drives, or networks. Once inside, they can copy themselves and spread to other files or systems.
Computer viruses are unwanted software programs or pieces of code that interfere with the functioning of the computer. They spread through infected files, data, removable drives, and networks. Many viruses are designed to copy themselves and infect other files.
When a user opens or downloads an infected file, the virus may enter the computer and begin spreading.
A virus can hide inside an email attachment and infect the computer when the file is opened.
Infected pen drives and storage devices can transfer viruses from one computer to another.
Viruses can also spread through unsafe websites, downloads, and connected networks.
An overwrite virus destroys original file data and replaces it with its own code. The infected file may become unusable.
An append virus attaches itself to the end of a file and changes its original content.
A macro virus infects documents that contain macros, such as Word or Excel files.
A boot virus infects the boot sector of a storage device. It starts working when the computer boots.
A resident virus stays in memory after the computer starts and can infect files continuously.
A non-resident virus does not stay in memory. It infects files for a short time and then stops.
A file infector virus attacks executable files and spreads when those files are opened.
A worm is a harmful program that spreads from one computer to another without needing a host program.
A Trojan horse is malicious software that looks safe but is actually dangerous. It tricks users into installing it.
A polymorphic virus changes its form or code to avoid detection by antivirus software.
A virus may show some warning signs. If your computer behaves strangely, it may be infected.
Which virus infects the boot sector?