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The purpose of antivirus software is, as the name suggests, to block and delete viruses from the computer. The software can usually either be set to actively scan all files or to run the scan separately when wanted.
There are several antivirus software on the market and an unambiguously best one cannot be named. If you feel the need to get an antivirus software, it can be bought or sought online for free. Free software includes, for example, Avira and AVG. F-Secure is an example of a payable software. All of these are perfectly usable programmes, so by getting one you are already fairly safe from viruses.
Please note, however, that the antivirus software does not protect the computer from its user. So, remember to be careful when using the internet!