This video traces the evolution of QR codes, starting with Samuel Morse's telegraph code. It details the creation of barcodes, their limitations, and the development of QR codes by Masahiro Hara, inspired by Morse code. The video explains the structure of QR codes, including error correction (Reed-Solomon codes) and masking, and discusses their widespread adoption, fueled by open-source patents and smartphone integration. Finally, it addresses security concerns and the vast potential for future applications.