This is typically the student, but it can also search for changes that affect educators. The first name, last name, or Edgenuity ID here can also be searched here.
If the affected user listed is "No, Student," the action was likely part of a bulk update taken on multiple user accounts. Additionally, if a change was made that did not impact a student (for example, if an educator creates an announcement), the affected user is listed as "No, Student."