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What is a computer virus? What kinds of computer viruses are there? How to prevent computer viruses?

What is a computer virus? What kinds of computer viruses are there? How to prevent computer viruses?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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**Understanding Computer Viruses** **What is a computer virus?** A computer virus is a type of malicious software program ("malware") that, when executed, replicates by inserting copies of itself into other computer programs, data files, or the boot sector of the hard drive. When this replication succeeds, the affected areas are then said to be "infected." **Types of Computer Viruses:** 1. **File Infector:** Attaches to executable files and executes alongside the program. 2. **Macro Virus:** Targets software macros, often in products like Microsoft Office. 3. **Boot Sector Virus:** Infects the master boot record and can prevent the operating system from loading. 4. **Polymorphic Virus:** Alters its code to evade detection from antivirus programs. 5. **Resident Virus:** Embeds itself in system memory and can execute anytime an operation is performed. **Preventing Computer Viruses:** - **Install Antivirus Software:** Regular updates and scans are essential. - **Keep Software Updated:** Regular updates fix security vulnerabilities. - **Avoid Suspicious Links:** Don't click on unknown links or email attachments. - **Secure Web Browsing:** Use caution with downloads and enable browser security features. - **Data Backup:** Regularly back up important data to recover in case of infection.
Transcribed Image Text:**Understanding Computer Viruses** **What is a computer virus?** A computer virus is a type of malicious software program ("malware") that, when executed, replicates by inserting copies of itself into other computer programs, data files, or the boot sector of the hard drive. When this replication succeeds, the affected areas are then said to be "infected." **Types of Computer Viruses:** 1. **File Infector:** Attaches to executable files and executes alongside the program. 2. **Macro Virus:** Targets software macros, often in products like Microsoft Office. 3. **Boot Sector Virus:** Infects the master boot record and can prevent the operating system from loading. 4. **Polymorphic Virus:** Alters its code to evade detection from antivirus programs. 5. **Resident Virus:** Embeds itself in system memory and can execute anytime an operation is performed. **Preventing Computer Viruses:** - **Install Antivirus Software:** Regular updates and scans are essential. - **Keep Software Updated:** Regular updates fix security vulnerabilities. - **Avoid Suspicious Links:** Don't click on unknown links or email attachments. - **Secure Web Browsing:** Use caution with downloads and enable browser security features. - **Data Backup:** Regularly back up important data to recover in case of infection.
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