XEON processors were developed exclusively to cater the server and hosting market. They are designed to run on lower voltage, stay cool for continuous for 24/7 usage. They were designed to be used in multi socket motherboards. This is the same reason why Mac computers, servers and home devices make use of this processor line. This line of processor is having multiple cores but has specific core variety based on the type of XEON processor being compared.
XEON being one of the costlier processors, they get updated on the architecture and testing lot quicker than the i7, i5 and i3 series of processors. They are being used in rackmounted servers with requirement for low heat dissipation and less consumed energy. Considering their cost and the lack of overclocking support, they are not usually preferred for gaming and the bitcoin users on desktop.
Few more thins to note that XEON series processors support ECC memory, which is not supported by regular Core processors like i7 and i5. They also known to have much larger cache compared to iX line of processors. This sort of features in itself pays off for the price paid to the processor. So they are also going to cost less for power spent on them.
Considering this sort of processors are meant for enterprise business and the serious line of servers. They are not meant for the desktop, though you can definitely use them if you have money and respective architecture to accommodate them.
