High Quality Content by WIKIPEDIA articles! A vector processor, or array processor, is a central processing unit (CPU) that implements an instruction set containing instructions that operate on one-dimensional arrays of data called vectors. This is in contrast to a scalar processor, whose instructions operate on single data items. The vast majority of CPUs are scalar. Vector processors first appeared in the 1970s, and formed the basis of most supercomputers through the 1980s and into the 1990s. Improvements in scalar processors, particularly microprocessors, resulted in the decline of traditional vector processors in supercomputers, and the appearance of vector processing techniques in mass market CPUs around the early 1990s.

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