The definition of Lean is a set of principles and practices that emphasize the elimination of waste in order to create value for customers. Lean is based on the idea that the most efficient way to do something is to reduce the amount of time, effort, and resources required to produce a product or service. The five pillars of Lean are: Eliminate Waste, Create Flow, Respect People, Pursue Perfection, and Create Value. Eliminating waste is the foundation of Lean and involves identifying and eliminating activities that do not add value to the customer. Creating flow is about making sure that the production process is efficient and that there are no delays or bottlenecks. Respect people is about recognizing the importance of employees and their contribution to the success of the organization. Pursuing perfection is about continuously striving to improve processes and products. Finally, creating value is about ensuring that the product or service meets the customer’s needs and expectations. Lean is an effective way to increase efficiency and reduce costs, and the five pillars of Lean are essential to its success.