Why is it that there's a lot of viruses for windows but not for mac?

I Tell You Why? have you never heard "Mac are the Safest OS On Earth" and Most of the Government throughout the world uses Mac to Avoid their Data leak. windows has very user friendly option and even it's programming is really easy but for mac it's really complicated to program a virus because Mac has Been programmed in a very flawless structure/code... this is why very less hackers are able to brake into an mac system.

Partly because microsoft is the most popular OS, so hackers concentrated on making virus for this os. As someone said if mac were the leader they would probably have the same problem.

Well in my own opinion, windows has so many security flaws. Hackers and viruses can easily invade windows. It maybe also because windows is the most used operating system in the world. A lot of people use it therefore a lot of target for the hackers. Whereas mac has a very good security. And only few people are using it due to the high price and slow software development making it a non-targeted or low targeted system for hackers.

The reason is Bill Gates and the domination of Microsoft among other operating systems. Beleive me if today Macs were installed on every produced 8 to 9 computer out of ten in the world, there would be tons of mac viruses. Everybody is happy with this except us. Anti-virus companies are making hundreds of millions from virus attacks.