Polymerase chain reaction or PCR, is a strategy to make numerous duplicates of a particular DNA area in vitro (in a test tube instead of a life form). The polymerase chain reaction empowers researchers to acquire the substantial amounts of DNA that are required for different investigations and methods in molecular science, forensic examination, evolutionary science, and therapeutic diagnostics. PCR depends on utilizing the capacity of DNA polymerase to orchestrate new strand of DNA integral to the offered template strand.