Anti-virus software sometime known as Anti- malware software, is computer software used to prevent, detect and remove malicious software. Antivirus software was originally developed to detect and remove computer viruses.in particular Modern antivirus software can protect from: 1. maliciuos browser helper objects( BHOs) , 2.browser hijacker ransomware, 3.keyloggers, 4.backdoors, 5.rootkits, 6.trojan horses worms, 7.malicious LSPs dialers, 8.fraud tools adware and spyware.There are different types of antivirus software can be used to protect the important datas from computers and keep data safe. List of important antivirus software are 1. Norton antivirus , 2. Avira antivirus, 3. Mcafee antivirus, 4. Kaspersky antivirus , 5.Avast antivirus , 6. Panda security antivirus these are lists of software which is helpfull to keep safe the Very Important Data. And antivirus is available in different mode free and paid version and all the software playing different role to give security to the computer system.