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A computer program or series which cause damage to our computers. it can copy it self any where. to protect our computer from virus people used to install antivirus which protect our computer from virus. virus can be ignored by not downloading some thing from net.

hope it will help u   
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Whether in the human body or on a computer, a virus is a disease-causing agent. If you come down with a nasty stomach virus, be sure to drink lots of water, get lots of rest, and stay near the toilet.Virus comes from a Latin word that was spelled the same way. It specifically referred to the poisonous sap of certain plants, which explains why it sounds similar to viscous, a word meaning "sticky." Nowadays, it’s used to describe something that causes infectious diseases, specifically a tiny, self-replicating agent made up of genetic material and protein.

Hope this helps:)
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