Computer virus is a part of software, virus effect the system software and the other function of computer, whereas the computer navigation may be slow, and also causes virus spread among computer and software as well as data.

1. Computer Virus Definition
Computer virus is a part of software, virus effect the system software and the
other function of computer, whereas the computer navigation may be slow,
and also causes virus spread among computer and software as well as data.
Virus always targets disrupt system effect the massive operational issues If
virus spreads in your software program, then the system loss the data and also
work will slow. The major thing to know about computer viruses is that these
are designed to spreads over the programs and software systems. When the
virus comes in your system via unknown thing using which can damage your
document or software that is attached to via networks, file sending and sharing
or as well as email attachments.
Speed Of System
Due to virus the user cannot smoothly navigate the system because when
system would have virus so then system running slower and unwilling your
application and internet as well as your software runs slow.
Windows Pop-Up
Unwelcome pop-up reaching on a computer or web browser indicator signs of
a computer virus. Unwelcome pop-up sign indicate the malware, viruses, or
spyware damaging a device.
Crashes Device
Unwillingly system crashes and damages the computer itself surprisingly
closing down are basic indicators of a virus. Due to computer viruses,
computer to perform in a variety of different way.
Accounts Being Logged Out
Some viruses are meant to target particular programs, either crashing them or
making the user automatically log out of the service.

2. Sending Bulk Emails From Your Email Account
Email is frequently used to propagate computer viruses. Hackers can spread
viruses and conduct larger cyberattacks via other people's email accounts.
Your Homepage Might Change
Any unanticipated alterations to a computer, such as changing your system's
homepage or updating any browser settings, are indicators that a virus may be
present on the device.
Why Do Computer Viruses Attack and Damage?
In the early beginning of Computers, Viruses are spreading between devices
and software, as we are seeing that nowadays, Viruses can however be spread
via hard disks and others thing.
Computer Viruses types
Devices can become infected by a variety of computer viruses. The prevention
of computer viruses and methods for getting rid of them are covered in this
section.
Resident Virus
The way viruses spread is through infecting host computer software. By
infecting apps as they are opened by a user, a resident virus does this.
Specific Action
A direct action virus gains access to the system's main memory and corrupts all
of the files, folders, and programs found in the autoexec.bat path before
erasing itself.

3. Multipartite Virus
A multipartite virus infects and spreads across computers using a variety of
strategies. Usually, it stays in the computer's memory until it infects the hard
drive.
Browser Hijecker
An application called a "browser hijacker" alters the default settings of online
browsers, such as the homepage, new tab page, and default search engine.
Overwrite Virus
Overwrite viruses are incredibly harmful. Data can be deleted, and new code
or file content can be added in its place.