pop popa wrote:
Do i need other internet security on my i mac?
You don't say what security you already have.
If you have wifi enabled ensure that the network is secured with a strong password using WPA2, not WEP.
Turn your Firewall on in System Preferences>Security (some on here may disagree with this).
You don't need an anti virus program, but if you do choose to install one the one that is most recommended on here as trouble free on Macs is clamXav. Whatever you do, don't install MacKeeper.
Others will probably add to this list of suggestions.