Why is it important to establish a definition of done?

The definition of done specifies the requirements for completeness of a work product or increment of value1. It is important to establish a clear and consistent definition of done across all Agile Teams to ensure that the work products meet the appropriate quality standards and are ready for integration and delivery23. Without a common definition of done, there may be confusion, rework, delays, and technical debt3.

References:

•What is the Definition of Done (DOD) in SAFe®? - Agilemania

•Built-In Quality - Scaled Agile Framework

•Definition of Done - Scaled Agile Framework