This report discusses the role of disruptive innovation theory in the success of Monzo Bank Ltd, a mobile-only bank in the UK. It provides an overview of the theories of innovation and principles of disruptive innovation. The report also discusses the background of Monzo Bank Ltd and its innovative role in the banking industry. The report concludes that Monzo is an example of disruptive innovation in the field of banking, providing a simple and secure way to manage money through mobile phones.