What is the summary of the book Competing Against Luck?

The book "Competing Against Luck" by Christensen, Hall, Dillon, and Duncan introduces a concept called "Job to be Done". This concept refers to a need that a customer intends to fulfill using a product. The authors of this book believe that the success of a product in the market depends on how well it performs the "Job to be Done" for the customer. This book helps companies to provide better products and services by better understanding the needs of their customers.