how viruses work in computer?

how viruses work in computer?
A virus operates by inserting or attaching itself to a legitimate program or document that supports macros in order to execute its code. In the process, a virus has the potential to cause unexpected or damaging effects, such as harming the system software by corrupting or destroying data.
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How did computer viruses start?
Most viruses have been designed to steal users' information, processing power and/or disable the system all together. The first computer virus, called "Creeper system", was an experimental self-replicating virus released in 1971. It was filling up the hard drive until a computer could not operate any further. Jul 5, 2017
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How is a computer virus created?
A computer virus is a type of computer program that, when executed, replicates itself by modifying other computer programs and inserting its own code. If this replication succeeds, the affected areas are then said to be "infected" with a computer virus. Computer viruses generally require a host program.
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What are the 4 types of computer viruses?
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What are the types of computer virus?
File-infecting Virus. A virus that attached itself to an executable program. ...
Macro Virus. This type of virus is commonly found in programs such as Microsoft Word or Excel. ...
Browser Hijacker. ...
Web Scripting Virus. ...
Boot Sector Virus. ...
Polymorphic Virus. ...
Resident Virus. ...
Multipartite Virus.
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What is a computer virus how can it affect your computer?
A computer virus is a malicious piece of computer code designed to spread from device to device. ... Designed to replicate relentlessly, computer viruses infect your programs and files, alter the way your computer operates or stop it from working altogether.
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What is virus and how it works?
A virus puts its information into a cell—a bacterial cell, a human cell, or animal cell, for example. It contains instructions that tell a cell to make more of the virus itself, in the same way a computer virus getting into a computer tells the computer to make more of itself. Viruses are not living things. Apr 3, 2020
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