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“Lean startup is a methodology for developing businesses and products, which aims to shorten product development cycles and rapidly discover if a proposed business model is viable; this is achieved by adopting a combination of business-hypothesis-driven experimentation, iterative product releases, and validated learning.” — Wikipedia

Globally, 90% of startups fail (Forbes) and the number one reason is market failure: “They make products no one wants.” (Fortune).
The lean startup methodology was born in Silicon Valley in the 90s, but the use of the word “lean” has its roots in Toyota's lean production system. Please check out the Digital Lean Yellow Belt​​​​​​​ course in Edu SPACE to learn more about Lean. Toyota’s lean manufacturing system was used to build things efficiently, yet it doesn’t tell what should be built.

“The Lean Startup provides a scientific approach to creating and managing startups and get a desired product to customers’ hands faster. The Lean Startup method teaches you how to drive a startup-how to steer, when to turn, and when to persevere-and grow a business with maximum acceleration. It is a principled approach to new product development.” - Eric Ries

If you haven't already read the book "The Lean Startup" by Eric Ries and don't have time; you may find the following summary useful.

https://www.youtube.com/watch?v=RSaIOCHbuYw​​​​​​​