The companies at the Google end of the continuum are called startups when they’re young. The reason I know about them is that my wife Jessica and I started something called Y Combinator that is basically a startup factory. Since 2005, Y Combinator has funded over 4000 startups. So we know exactly what you need to start a startup, because we’ve helped people do it for the last 19 years.
Source: How to Start Google