Polymerase Chain Reaction (PCR) is a molecular technique used to amplify specific DNA sequences, generating millions of copies from a tiny sample. Widely used in diagnostics, research, and forensics, PCR enables accurate detection of genetic material, pathogens, or mutations with high sensitivity. https://medium.com/@xelleratherapeutics/polymerase-chain-reaction-pcr-the-tiny-test-that-transformed-modern-science-8e858f9b9be6