The Definition of Done is a formal description of the state of the Increment when it meets the quality measures required for the product. The Definition of Done is used to assess when work is complete on the product Increment.
The Definition of Done is defined by the Scrum Team, not by the Product Owner alone. The Scrum Team consists of one Product Owner, one Scrum Master, and Developers. They are all accountable for creating a valuable, useful, and potentially releasable product Increment each Sprint.
The Product Owner is accountable for maximizing the value of the product resulting from the work of the Scrum Team. The Product Owner is responsible for managing and refining the Product Backlog, collaborating with the stakeholders and the Developers, and ordering the items in a way that best achieves goals and missions. The Product Owner represents the interests of everyone with a stake in the product and ensures that the Scrum Team works on the right things at the right time.
The Developers are accountable for creating a “Done” Increment that meets the Definition of Done each Sprint. The Developers are responsible for planning and executing the Sprint Backlog, designing and building the product functionality, testing and improving the product quality, and delivering a potentially releasable Increment. The Developers work closely with the Product Owner to understand and clarify the Product Backlog items, provide feedback and estimates, and suggest improvements and innovations.
The Scrum Master is accountable for establishing Scrum as defined in the Scrum Guide. The Scrum Master is responsible for promoting and supporting Scrum as defined in the Scrum Guide. The Scrum Master does this by helping everyone understand Scrum theory and practice, both within the Scrum Team and the organization.
The Definition of Done may vary from one Scrum Team to another, depending on the context and domain of work. However, it must be consistent within one team. If there are multiple Scrum Teams working on one product, they must share a common Definition of Done. If there is an organizational standard for a Definition of Done, all Scrum Teams must follow it as a minimum.
Scrum Guide: https://www.scrumguides.org/scrum-guide.html
Definition of Done: https://www.scrum.org/resources/what-is-a-definition-of-done
Product Owner: https://www.scrum.org/resources/what-is-a-product-owner
Developers: https://www.scrum.org/resources/what-is-a-developer-in-scrum
Scrum Master: https://www.scrum.org/resources/what-is-a-scrum-master
