Buying a code only

Ellen, AVG Internet Security 2015 includes Anti-Virus protection. Have a look @ this webpage (http://www.avg.com/ww-en/internet-security) [Scroll Down].
AVG Guru

Hi everyone,  I'm trying a free trial of AVG Security 2015.  I was phished and it found two malware sites and deleted them and the problem has gone away.  However, in looking to buy, I'm unclear whether or not I should buy this, or Anti-Virus protection, or what, exactly.  I see that you can buy just a code, also.  What does that do for me, and how would I use it?  I'd appreciate any answers, thanks,  Ellen, an AVG novice

Ellen, AVG Internet Security 2015 includes Anti-Virus protection. Have a look @ this webpage (http://www.avg.com/ww-en/internet-security) [Scroll Down].
AVG Guru