What is Speedgrader?
Speedgrader is the Canvas marking tool which allows you to view, annotate, comment on, and grade student assignment submissions online. In addition to grading online submissions, Speedgrader can also be used to provide comments and grades on work that is not submitted online (in-class presentations or paper-based submissions, for example).
For further information:
Canvas Doc: How do I use SpeedGrader?
Canvas Doc: How do I grade group assignments in SpeedGrader?
Canvas Doc: How do I add annotated comments in student submissions using DocViewer in SpeedGrader?
Canvas Doc: How do I sort the student list in SpeedGrader?
Canvas Doc: How do I set up a moderated assignment to be graded by multiple reviewers?