It is documentation that includes the remaining work to reach the final product.
Sprint backlog
It is a sub-document of product backlog which contains the details and backlogs in a sprint or simply the remaining tasks to be completed in the sprint.
It is a graphical representation of the remaining tasks to reach the final product and can be used to track the progress of the development of the product in one view.
Product increments
It is just the sum of total works completed in a sprint and the results in the previous sprints.