Do I need anti-virus software on my Mac?

The Mac has grown popular enough that nefarious hackers are paying attention. Do you need anti-virus software?

There was a time when Mac computers were considered a niche market and many users just didn’t bother with anti-virus software. Apple’s desktop and laptop computer have really taken off over the past few years and that means it is more important than ever to stay protected from malicious attacks on your personal data.

How can I protect my Mac right now?