PC vs. Mac (how are Macs virus free?)?

The reason Macs are often called virus free is because viruses are made by people to target the computer operating system most people have, which is a Microsoft PC. Fewer ppl have Macs, so the people who create viruses don't waste their time figuring out how to mess up Macs. In the future though, there will be as many Mac viruses as there are PC. The best thing to do is just to get a good antivirus.