GUNILLA ELAM / SCIENCE PHOTO LIBRARY GUNILLA ELAM / SCIENCE PHOTO LIBRARY
Computer viruses. Conceptual computer artwork of a computer under attack from different viruses, including worm viruses (blue) and trojan viruses (boxed). A computer virus is a malicious program that is often able to spread itself to other computers. The computer is trying to defend itself, which could indicate the use of a firewall or anti-viral software.
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