Hackintosh Computer is running macOS in hardware not manufactured by Apple. As a little hacking involves the name derived as Hackintosh.
1 Why Hackintosh?
macOS is a great, fastest and safest operating system with many features and facilities but it runs on Macs, the real apple hardware, but Apple Macintoshes are expensive, not everyone could afford to buy it.
but for the half of the price of Macintosh, you can make a Hackintosh system and you can upgrade it too in the near future. Hackintosh actually saves your money and Hackintosh is the cheapest solution for using macOS.
2 Comparison Between Genuine Mac & Hackintosh
3 Is Hackintosh legal?
Sort of. Installing OS X on non-Apple hardware is a violation of the EULA (End User License Agreement), but the general rule is unless you are a business selling Hackintoshes, Apple does not care.
Apple knows we exist and have had plenty of opportunities to stop us, but they have never so much as tried.
4 Is Hackintosh Stable?
It depends on the machine and the install.
When you build a machine for running macOS, generally you can get it to function as good as a real mac. but Hackintoshes are completely unsupported.
You will have to be your own tech support, but do not be nervous, there are a ton of great online resources and you can learn pretty much everything you need from reading.