Final answer:
A virus is an unwanted program on a computer that can attach itself to various files and disrupt normal operations.
Explanation:
An unwanted program running on a computer is called a Virus. It is a small piece of code that can migrate through networks and attach itself to different program files, disrupting normal computer operations.
Viruses cannot replicate themselves and require human intervention for transportation. When a virus infects a file, that file then infects other files, creating obstacles in the computer's functionality.
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