How is the amplification of a gene sample of interest carried out using Polymerase chain reaction?

dsDNA is denatured at high temperature in unzip them,Annealing, using two sets of primers, amplification in the direction of 5’----> 3’ using Taq polymerase, this enzyme is thermostable, (source is Themus aquaticus) 1 billion times amplified in 30 cycles.