I just wonder how necessary it is to add a security package such as Intego or Bitdefender or AVG to protect my MacBook Air. And if I need to add one, what are the best value for money?
MacBook Air (13-inch Mid 2013), OS X Yosemite (10.10.5)
None. You will get 0 value for your money, no matter which one you choose. They will all do more harm than good. There are no true viruses in the wild that can affect OS X. There is 'malware' out there, but common sense will protect you from those.
I have never installed an anti-virus. However, my sister installed a bogus Flash update and all her browsers were hijacked.
I explained to never install anything unless you go to the actual site. Adobe in her case.
I managed to clean out her system using AdwareMedic which is now MalwareBytes.
I also had her use Chrome exclusively since it has Flash built-in.
As KiltedTim has already told you there are no security apps that you need. Do not ever run any "cleaning" or "optimizing" apps on your Mac either. Be sure to set the System/Security & Privacy settings to be "Mac App Store and identified developers" or just the Mac App Store.
In Safari's General preference pane do not check this checkbox:
What extra security programmes does my MacBook Air need?
