The Japanese television format adapted into the UK programme Dragon's Den is Money Tigers.
Money Tigers was the original format in which entrepreneurs pitched business proposals to wealthy investors. The concept was later adapted for several countries, with the British version becoming Dragon's Den and the American version becoming Shark Tank.
The format's central idea is consistent across editions: a presenter introduces entrepreneurs, who explain their product, financial performance and investment request. The investors then question the founders and may offer money for equity. Offers are not automatically completed after filming, because due diligence can change or cancel a proposed deal.
A common mix-up is treating Dragon's Den as an entirely original British invention. The UK title, panel structure and production style are British adaptations, while the underlying television concept originated in Japan. The name Money Tigers refers to the original Japanese programme rather than a UK Dragon.