People mostly admired how certain business is so successful. What they are not aware of is that some of those businesses went through some tough times, really tough times.
However, business is usually started when the co-founders or owners came with some ideas to solve their own problem or someone else problem. Some ideas take times to be recognised and accepted. Only then the business can have some monetary return.
How AIRBNB Started: ideas to rent, got rejected by investors.
How ALIBABA Started: connecting with people
How ANGRY BIRDS Started: made a lot of games but all failed, never give up.
How LINKEDIN Started: professional social network, invite close contacts
How PINTEREST Started: side project, just do it -- without plan, switched ideas
How UBER Started: from file sharing, to car sharing