The essential trait to win the scrum methodology is the continuous communication between the PRODUCT owner and the development team. They both need to collaborate at every step in the development to make sure the team is delivery what is expected and there are no SURPRISES at the end of the sprint. The product owner helps the team to look at the bigger picture, this role helps the team to understand the ‘Why’ of the product. During the sprint, the Product Owner helps the team in letting them know the priority so that in the sprint PLANNING they commit as the priority. 

During the course of the sprint, the team touches base with the product owner as and when they feel, they can demo something to get the early feedback rather than waiting till the end of the sprint. Along with this, the team also SITS with the product owner to groom the stories for the upcoming sprint so that they can refine and add the required details to the story and make it in a ready state to be pulled. The constant collaboration between these two helps in early resolution of dependencies or blockers and also reduces the chances of developing something which is not in the scope.