Do I need an anti-virus for Mac?

Does an Apple Mac need an anti-virus?
I am a new Mac user (13'' MacBook Pro) and I am wondering if I need to install an anti-virus software to prevent problems like those I encountered with my PC.
I have seen numerous anti-virus programs available online (I uploaded the screenshot) but I'm not sure if I should download one because a lot of people say I don't have to.
Hoping you could answer my question.
Thanks!

