The Purpose Of Antivirus Software And How It Works To Protect A Computer System.

[harsh]

The purpose of antivirus software is to detect, prevent, and remove malicious software, commonly known as malware, from a computer system. Malware includes viruses, worms, trojans, spyware, and other harmful programs that can compromise the security and functionality of a computer.

Here's how antivirus software works to protect a computer system:

1. Signature-Based Detection: Antivirus programs maintain a database of known malware signatures. These signatures are unique patterns or characteristics of known malicious code. When the antivirus scans files or the system, it compares the code to its signature database. If it finds a match, it flags the file as potentially harmful.
2. Heuristic-Based Detection: Antivirus software also uses heuristic analysis to identify potential threats based on their behavior or characteristics. Instead of relying solely on known signatures, heuristics analyze the behavior of programs and files. If a file exhibits suspicious behavior, even if it doesn't match a known signature, the antivirus may flag it as a potential threat.
3. Behavioral-Based Detection: Some advanced antivirus solutions monitor the behavior of programs in real-time. If a program suddenly starts exhibiting malicious behavior, such as unauthorized access or changes to system settings, the antivirus can intervene and block the activity.
4. Sandboxing: Some antivirus software utilizes sandboxing, creating isolated environments to execute suspicious files. By running the file in a controlled environment, the antivirus can observe its behavior without risking harm to the actual system. If the file behaves maliciously, it can be flagged and prevented from affecting the real system.
5. Real-Time Protection: Many antivirus programs provide real-time protection by constantly monitoring the activities on a computer. Any attempt to download, install, or execute a potentially harmful file triggers immediate action, such as blocking the file or quarantining it.
6. Automatic Updates: Antivirus software regularly updates its signature database to stay current with emerging threats. Automatic updates ensure that the antivirus program is equipped to recognize and combat new forms of malware.
7. Quarantine and Removal: When a potential threat is identified, the antivirus software may quarantine the file, isolating it from the rest of the system to prevent further damage. Users can then review the quarantined items and decide whether to remove or restore them.

[SwatiSood]

1. Detection: Antivirus software continuously scans files and programs on a computer system to detect any suspicious or malicious code. It employs a variety of detection techniques, such as signature-based detection, heuristic analysis, behavioral analysis, and machine learning algorithms to identify known and unknown threats.
2. Prevention: Once a threat is detected, antivirus software takes action to prevent it from causing harm to the system. This may involve quarantining or deleting infected files, blocking malicious websites, or stopping malicious processes from executing.
3. Real-time Protection: Many antivirus programs provide real-time protection by monitoring system activities in the background. They actively scan files as they are accessed, downloaded, or executed to intercept and neutralize any threats before they can cause damage.
4. Updates: Antivirus software relies on regular updates to stay effective against evolving threats. These updates include new virus definitions, malware signatures, and software patches to address vulnerabilities in the antivirus program itself.
5. Scanning Options: Antivirus software typically offers different scanning options, including full system scans, quick scans, and custom scans. Users can schedule scans to run automatically at specified intervals to ensure comprehensive protection.
6. Firewall Integration: Many antivirus suites include firewall functionality to monitor network traffic and prevent unauthorized access to the system. Firewalls act as an additional layer of defense against network-based attacks.
7. Email Protection: Antivirus software often includes email scanning capabilities to inspect incoming and outgoing emails for malicious attachments or links. This helps prevent the spread of malware through email-based attacks, such as phishing and spear-phishing.
8. Browser Protection: Some antivirus programs offer browser extensions or plugins to protect users while they browse the internet. These tools can block malicious websites, warn users about potentially harmful links, and safeguard against online threats like drive-by downloads and malicious scripts.