Coprocessor is a single chip built for performing scientific computations at high speed. This chip is a companion to the original or host processor. A coprocessor is a computer processor used to supplement the functions of the primary processor (the CPU). It can be used to perform various operations. It is used to perform specialized function.
 The general-purpose processors such as 8086 or 8085 are not optimized to do arithmetic manipulations, CRT display manipulation and word processing. Hence we go for a coprocessor, which is capable of doing dedicated functions (Special Operations) to increase the overall execution speed of larger systems. 

Coprocessor is connected in parallel with the main processor, and they operate on the same buses with the same instruction byte stream.

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