Definition of done
Who creates defeinition of done?
When is it created?
The Scrum Guide says:
If the Definition of Done for an increment is part of the standards of the organization, all Scrum Teams must follow it as a minimum. If it is not an organizational standard, the Scrum Team must create a Definition of Done appropriate for the product.
The Developers are required to conform to the Definition of Done. If there are multiple Scrum Teams working together on a product, they must mutually define and comply with the same Definition of Done.
A Definition of Done will be needed no later than Sprint Planning, because the Developers must understand the work that will be required for an Increment to be finished.