Antivirus is the Programme / software to kill viruses in your laptop, Desktop Computer, Memory Card, Pen Drive or External Hard Disk Drive. It will help full to select the right one.
Below link will give you the detail information & review about the antivirus
http://in.pcmag.com/antivirus-from-pc-ma/34241/guide/the-best-antivirus-protection-of-2017