The Product Backlog is an important list of items that includes everything that needs to be included in the final product. It consists of all of the Development Team's ideas, as WELL as the requirements of the Stakeholders, Product Owners, and others. 

It serves as a source of prerequisites for product adjustments that must be MADE. Because all Sprint Backlogs are sourced from Product Backlogs, they can be regarded a subset of Product Backlogs. The Scrum process adds features and updates to the product in Sprints. 

Here are the differences between these TWO backlogs: 

• The product backlog is a list of all the tasks that must be done before the final product may be created. The sprint backlog, on the other hand, is a list of all the items from the Product Backlog that must be done in ORDER for the Sprint to be completed. Also included is a strategy for converting the selected elements to an Increment. 
• The Product Owner has the responsibility of gathering, prioritizing, and refining the Product Backlog items. On the other hand, the Development Team is in charge of developing the Sprint Backlog and working on it in order to finish the Sprint on time. 
• The Product Backlog is dedicated to the product's overall goal while the Sprint Backlog solely pertains to the Sprint goal for that Sprint. 
• Depending on the customer's vision, there may be opportunities to alter the product backlog. On the other hand, the Sprint Goal will not change throughout the Sprint, but the Sprint Backlog may change depending on the Sprint. 
• The Product Backlog is the entire collection or list of tasks that must be accomplished in order to fully DEVELOP the product. The Sprint Backlog is a subset of the Product Backlog that gets finished in a Sprint. 
• The Product catalog has nothing to do with the Sprint Backlog, whereas the Product Backlog is the sole determinant of the Sprint Backlog.