Start Up basically a Business which has been conceived to be, beiger than a mere Business.
If you have an Idea or you already have a business which can be grown beyond limits- It Could Be A Start-Up.
"Startups are businesses that want to disrupt industries and change the world—and do it all at scale. Startup founders dream of giving society something it needs but hasn’t created yet—generating eye-popping valuations that lead to an initial public offering (IPO) and an astronomical return on investment."
Forbes