Discover the remarkable journey of Slack, the fastest-growing business app in history, as co-founder Cal Henderson discusses the company's success, challenges, and future plans with Mamoon Hamid at Web Summit 2018. Explore the factors behind Slack's rapid growth, its product-market fit, and how it addresses productivity and distractions in the workplace. Learn about the company's biggest competitors, notable mistakes, and its focus on serving knowledge workers. Gain valuable insights into the evolution of workplace communication and collaboration tools in this engaging 22-minute conference talk.