Which is the best antivirus and spyware for Mac?

Good morning,
Because of schoolwork and extracurricular activities, I am constantly sending and receiving e-mails and messages to and from PCs and other Apple devices, like IPads. Two years ago I purchased a 120,12GB MacBook Air and, until a few months ago, it went perfectly well.
I am not sure what happened, but lately, every time I go online, whatever I click -whether it is a random letter in a website, or a blank space in a page, anything- an advert appears or a new -unwanted- tab opens with publicity and such, the kind of additional tabs that open when you are watching movies online in a random website, but this time, it is happening with every website (even the Apple site) and almost constantly. I suspect it is something I downloaded or maybe something I received from an infected PC that I got a virus or problem from.
I tried using the MacKeeper software, but it is not working for me (?). Also I tried blocking pop-ups (I use Google Chrome), Java Script, automatic downloads, complements and everything I could when going online, but it has not gotten better over the last 9 months. My parents also recommended me a very good technician, who I personally know and has solved many of my previous problems, but he could not help me, in this situation.
For that reason, I have been considering either purchasing a good antivirus for my Mac or a new Mac and an antivirus for it, to prevent future problems like this one.
Either way, the question is the same,
Which is the best antivirus and spyware software for Mac?
Thank you so much for your attention.

Please get rid of MacKeeper, as it and most other such junk software will do more harm than good.
Please review the options below to determine which method is best to remove the Adware installed on your computer.
The Easy, safe, effective method:
http://www.adwaremedic.com/index.php
If you are comfortable doing manual file removals use the somewhat more difficult method:
http://support.apple.com/en-us/HT203987
Also read the articles below to be more prepared for the next time there is an issue on your computer.
https://discussions.apple.com/docs/DOC-7471
https://discussions.apple.com/docs/DOC-8071
http://www.thesafemac.com/tech-support-scam-pop-ups/

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