Hyper-Threading
Abbreviated as HT, Hyper-Threading is a technology developed by Intel and introduced with the Xeon processor and later included with the Intel Pentium 4 processor. HT allows the processor to work more efficiently by processing two sets of instructions at the same time, making it look like two logical processors. In addition, software that has been written for dual processor computers or multi processor computers are still compatible with HT.
Note: Hyper-Threading should not be confused with HyperTransport, which can also be abbreviated as HT.
Also see: Dual-core, Processor definitions