Hello, depends on how prone you are to Phising & Pop-ups mainly.
ClamXAV, free Virus scanner...
Or Intego VirusBarrierX...
Little Snitch, stops/alerts outgoing stuff...
You may find this User Tip on Viruses, Trojan Detection and Removal, as well as general Internet Security and Privacy, useful:
The User Tip (which you are welcome to print out and retain for future reference) seeks to offer some guidance on the main security threats and how to avoid them.
Bear in mind that from April to December 2011 there were only 58 attempted security threats to the Mac - a mere fraction compared to Windows malware:
(I have ClamXav set to scan incoming emails, but nothing else.)
Unhappy ipad2user wrote:
So, having only had my I-Mac for around a month now the $64,000 question is
' Do I need any Security Software or not and if I do what is the best one to have ? '
Not sure why you posted this in the Mac OS X v10.4 Tiger forum. Your profile says you are running Lion on your iMac. If you were still using Tiger I would have much different advise for you.