The most significant type of viruses is following:-
Boot sector virus: - it infects a master boot record or boot record and spreads when a system is booted from the disk containing the virus.
Parasitic virus: - the traditional and most common form of virus .it is also called as file virus. A parasitic virus attaches itself to executable files and replicates, when the infected program is executed, finding other executable files to infect.
Stealth virus :- A form of virus explicitly designed to hide itself from detecting by antivirus software.
Polymorphic virus:- A virus that mutates with every infection, making detection by the “signature” of the virus impossible.
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