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Antivirus is software that scans for and removes malware from a device or network. It typically runs in the background and monitors devices, servers or mobile phones to look for malicious code that could damage the system or steal personal information. It then either blocks the malicious code, or notifies users that a threat has been detected and prompts them to clean the device.

Traditional antivirus programs rely on the unique binary patterns, or signatures, of malware to identify them. When a file or program is believed to contain malware, its signature is added to a database in the antivirus software, which then flags it for future scanning. Modern antivirus programs are more sophisticated, and employ techniques like cloud analysis to better combat new and evolving threats.

Virus Prevention

Antivirus programs aim to prevent malware from infecting a device or network in the first place. This may involve real-time scanning of files and programs, analyzing network traffic, and identifying suspicious behavior. Some antivirus programs also use heuristic detection, which looks for characteristics or behaviors commonly associated with malware.

Ransomware Prevention

One of the most dangerous types of viruses is ransomware, which encrypts the data on a device or network and then demands a payment from users to decrypt it. The best antivirus software is able to detect and stop this type of malware from infecting devices, as well as block attacks that seek to profit from stolen login credentials, credit card information or other sensitive data.