The virus is the most common Malware and can be one of the most dangerous. The virus is a program designed to self-reproduce and causes chaos, once in a system it will spread from file to file, device to device. It can spread in any way possible including emails and external devices. They usually part of executable files.
The difference between viruses and worms are viruses need a human action to move around and install while a worm can do this itself without any instruction.
Viruses can be minor and just produce annoying pop-ups and mess around settings on the device. To the extreme of corrupting files or even deleting them. It is even possible for them to steal information before deleting them.
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