Disruptive innovation describes a process where a product or service begins in simple, inexpensive applications and then improves in quality and performance until it meets the needs of mainstream customers, displacing existing options. Dell Computer grew rapidly by focusing on direct sales and building computers upon receiving customer orders rather than maintaining large inventories, allowing it to outcompete other PC manufacturers. Dell's success demonstrates how streamlining operations and targeting customer needs directly can enable a company to scale quickly through disruptive innovation.