How do you get primers for PCR?

Polymerase chain reaction:

1. It is a technique used in laboratories for the rapid production of a specific segment of DNA to make billions of its copies.
2. Polymerase chain reaction involves amplification of DNA sample using three basic steps.
3. The first step involves the denaturation of the DNA template to form single strands.
4. Synthesis of new strands by annealing the primers to each original strand is the second step.
5. The primers that are used for annealing are oligonucleotides that are synthesized artificially.
6. The last step involved in PCR is the extension of the newly formed DNA strands from the primers.