One of the basic ideas in Scrum is the backbone formed by Product Owner and the Agile Team, headed by their Scrum Master.
The Product Owner stands right in the middle of the business, knows every functional detail, is trusted and respected by his business colleagues. Furthermore he takes care of the acceptance and business implementation of products and features delivered by the Agile team.
The Scrum Master, with his team, takes care of the technical realization and delivery of new products and features.

Scrum advocates a very short, direct connection between the one who has a goal and the ones who deliver the solution to reach this goal. Scrum does not know a Projectmanager role. Traditional projectmanagement responsibilities are divided over the Product Owner and the Scrum Master roles.  Read more