Virus Definition
In the context of computers and information technologies, a virus is a program or piece of code that is loaded onto your computer without your knowledge and runs against your wishes. It has the ability to copy itself, and can cause harm by corrupting system files, destroying data, or otherwise disrupting system performance.
Virus Key Points
- A computer virus is a self-replicating piece of software that propagates itself by modifying other programs.
- Viruses harm the host system or network on which they are spread, by partially or completely disrupting its operation.
- They often install themselves on a target’s computer by exploiting a software vulnerability or tricking users into downloading them.
What Is a Virus?
A virus is a type of malware that, when executed, replicates by reproducing itself or infecting other programs by modifying them. Incorporating itself into a program, it then spreads from one computer to another. The term “virus” stems from its similarity to biological viruses which copy themselves in living cells.
Who Uses a Virus?
Malicious hackers or cybercriminals are usually the ones who create and use viruses. They use these tools to gain unauthorized access, steal information, or disrupt the operations of a network or computer system making money or creating havoc.
Where Does a Virus Operate?
A virus operates in the infected host’s computer where it attaches itself to a host program in the computer system. It can then spread to other computers or networks when the host program or system is shared or transferred.
When Does a Virus Act?
After successfully infecting a host system, a virus acts whenever the host software is activated. This allows the virus to replicate and spread before the user detects anything. In some cases, a virus can remain dormant and only activate at a specified time or when specific conditions are met.
Why is a Virus Dangerous?
Viruses are dangerous as they can result in data or system corruption, loss of sensitive information, and a decreased performance of the system due to the usage of system resources. Further, it might result in additional malware infection as some viruses work as a backdoor for other malicious software to infiltrate the system.
How Does a Virus Spread?
A computer virus spreads by creating copies of itself and attaching these copies to other computer programs. It often takes advantage of a network to spread, relying on security failures on the target computer or network. Some other methods of spreading include email attachments, file sharing, or malicious webpages.
