The document discusses the theory of disruptive innovation introduced by Clayton M. Christensen, highlighting how smaller companies with fewer resources can challenge established incumbents by targeting overlooked market segments. It explains that incumbents often exceed the needs of their most demanding customers, creating opportunities for disruptive entrants to improve and eventually move upmarket. Key points include that disruption is a process, incumbents should not overreact to disruption, and the theory guides strategic choices amidst new technology.