multi-CPU, multi-core and hyper-thread

Question

Could anyone recommend some documents to me to illustrate the differences between multi-CPU, multi-core, and hyper-thread? I am always confused about these differences, and

Answer 1

In a nutshell: multi-CPU or multi-processor system has several processors. A multi-core system is a multi-processor system with several processors on the same die. In hyperthreading, multiple threads can run on the same processor (that is the context-switch time between these multiple threads is very small).

Multi-processors have been there for 30 years now but mostly in labs. Multi-core is the new popular multi-processor. Server processors nowadays implement hyperthreading along with multi-processors.

The wikipedia articles on these topics are quite illustrative.