It is software that protects the system from virus attack. This software’s are downloaded on the internet. Some company releases original software’s some release duplicates. The best antivirus that we choose can give a long life for our computer. This software is created by professionals, who are programmers. Before it attacks the system our antivirus kit should be updated and kept. Daily we can update the virus and keep so that it cannot effect our system. Many antivirus kits are available in the internet. Some are free downloaded. If you want to by original software we can buy directly from the antivirus company. The antivirus which we buy should support the system. We can download or buy the latest version of antivirus kit which has many advantages and they will be updated up to date.