In artificial intelligence, an intelligent agent (IA) is an autonomous entity which observes through sensors and acts upon an environment using actuators (i.e. it is an agent) and directs its activity towards achieving goals (i.e. it is "rational", as defined in economics). Intelligent agents may also learn or use knowledge to achieve their goals. They may be very simple or very complex: a reflex machine such as a thermostat is an intelligent agent.
Take the Wright Brother’s first flight. There were only a handful of people watching the historic event, and it took them six years to even sell the first airplane. No one saw a multibillion dollar industry stemming from their invention.
Digital currency (digital money or electronic money or electronic currency) is distinct from physical (such as banknotes and coins). It exhibits properties similar to physical currencies, but allows for instantaneous transactions and borderless transfer-of-ownership.