If you're on the Internet all of the time then you're going to need something like Little Snitch. Even though viruses on the Mac are few and breaking in can be difficult, it's better to have one more layer of protection.
Little Snith is a dynamic firewall where you can set the properties on the fly when you know about them. So if you're protected and say your brother wants to share files with you, Little Snitch will pop up a window asking for permission to allow the transfer.
On the other hand, if Joe Hacker tries to break into your machine through the DNS port or email port then Little Snitch will popup a window asking for permission for Joe Hacker. You can say no and leave it at that.
I've been using Little Snitch for years and I've caught people trying to login with it. I've even caught my kids trying to get to my shared files (grrr). I think everyone should get a copy for their own protection.
Be aware that although the Mac is has very few virus problems and products like Little Snitch help keep hackers and nosy people away, there are times when issues are just unavoidable. Make sure your router is setup to deny incoming traffic unless you absolutely need it for games or whatever. Nothing in the computer world is perfect.
This is just a review and not a paid advertisement.
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