For years, many people have believed that Macs are immune to malware, viruses, and worms that have wrought havoc on PCs. In reality, however, OS X is potentially just as vulnerable to harmful programs. The difference lies in the fact that hackers generally go after what will give them the biggest bang for their buck. Traditionally, that has meant targeting PCs because they run on a more prevalent OS. Given OS X’s small market share in comparison to Windows systems, Macs are less likely than PCs to be attacked.