Presently no significant Mac viruses are in distribution; hackers have a propensity to target the Windows operating system due to the utter number of computer users. Apple claims the Mac is very much secure right out of the box, that it screens every file you download, and that it provides security updates to quickly address any prospective security threat.
Viruses that have an effect on Macs do exist, but because smaller number of users has Macs, hackers have a propensity to focus on Windows viruses. As Macs become more popular, more viruses may be produced. And, although Macs may be safe from most viruses, they can be compromised by Trojan horses and phishing attacks. Both of these require the user to download an infected file or enter information at an insecure site. Virus software may help avoid these threats.
Virus protection is not needed on a Mac, even though having it may offer assurance and peace of mind regarding any of the computer security issues. Being watchful when surfing the web is the best defense you have against viruses. To negate the possibility of compromising the safety of your Mac computer, refrain from downloading unknown files and avoid insecure sites.