from the scrum guide scrum guide
The Product Owner is responsible for maximizing the value of the
product and the work of the Development Team. How this is done may
vary widely across organizations, Scrum Teams, and individuals.
The Product Owner is the sole person responsible for managing the
Product Backlog. Product Backlog management includes:
Clearly expressing Product Backlog items; Ordering the items in the
Product Backlog to best achieve goals and missions; Optimizing the
value of the work the Development Team performs; Ensuring that the
Product Backlog is visible, transparent, and clear to all, and shows
what the Scrum Team will work on next; and, Ensuring the Development
Team understands items in the Product Backlog to the level needed. The
Product Owner may do the above work, or have the Development Team do
it. However, the Product Owner remains accountable.
The Product Owner is one person, not a committee. The Product Owner
may represent the desires of a committee in the Product Backlog, but
those wanting to change a Product Backlog item’s priority must address
the Product Owner.
For the Product Owner to succeed, the entire organization must respect
his or her decisions. The Product Owner’s decisions are visible in the
content and ordering of the Product Backlog. No one is allowed to tell
the Development Team to work from a different set of requirements, and
the Development Team isn’t allowed to act on what anyone else says.