Product backlog is one of the key concepts of agile software development. It is an organized, prioritized collection of users stories. An agile team can pull/select stories from the backlog and work on them in the next iteration/sprint.

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Confused about modifying the sprint backlog during a sprint

I've been reading a lot about scrum lately, and I've found what seem to me to be conflicting information about whether or not it's ok to change the sprint backlog during a sprint. The Wikipedia ...
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Product backlog- when do task hours get estimated?

I am wondering if when developing a product backlog do tasks have hours estimated for them. To confirm, i can talking about a product backlog here not a sprint backlog as I know it does have.