Computer Virus
- Malicious software that replicates and spreads between computers without user consent.
- Common effects include altering or deleting important files, stealing sensitive information, and disrupting normal system function.
- Basic protections: keep the operating system and antivirus software updated, avoid suspicious files/emails/websites, and back up important files regularly.
Definition
Section titled “Definition”A computer virus is a type of malicious software that replicates itself and spreads from one computer to another without the user’s knowledge or permission. These viruses are designed to infect and damage a computer system by altering or deleting important files, stealing sensitive information, and disrupting the normal functioning of the system.
Explanation
Section titled “Explanation”Computer viruses operate without the user’s consent and aim to compromise a system’s integrity and availability. They can alter or delete important files, steal sensitive information, and disrupt normal system functionality. Different virus types employ distinct methods to achieve these effects, including disguising themselves as legitimate programs or encrypting files to prevent access.
Examples
Section titled “Examples”Trojan horse
Section titled “Trojan horse”This type of virus disguises itself as a legitimate program or file. When the user downloads and installs it, the Trojan horse reveals its true intentions and can steal personal information, such as passwords and financial information, and disable important system functions.
Ransomware
Section titled “Ransomware”This type of virus encrypts the user’s important files and demands payment in exchange for the decryption key. If the user does not pay the ransom within a specified time period, the files will be permanently deleted. This can be devastating for individuals and businesses, as important files such as documents, photos, and videos may be lost forever.
Notes or pitfalls
Section titled “Notes or pitfalls”- To protect against computer viruses, regularly update the operating system and antivirus software.
- Avoid downloading or opening suspicious files or emails, and avoid visiting unknown or untrustworthy websites.
- Back up important files on a regular basis to minimize potential damage from an attack.
- Computer viruses are a serious threat to the security and stability of computer systems; understanding virus types and taking precautions reduces risk.
Related terms
Section titled “Related terms”- Malicious software
- Trojan horse
- Ransomware
- Antivirus software