Teaching and studying are all about interaction - no matter if you have a digital format or a traditional face-to-face class. In an online test, for instance, a "right" or "wrong" window that pops up after you have answered a question is the easiest kind of feedback. However, it does not promote the learning progress sustainably.
Good feedback should provide support by pointing out solutions. For example, it may include additional information or refer to the respective chapterofthe learning module, inspiring students to revise the content once again. Good feedback can also boost student motivation.
Feedback - from students or colleagues - is also important for teaching staff. Courses should be designed with a certain degree of flexibility, so that they can be adapted according to the feedback given. For example, queries in ILIAS that accompany the learning process provide useful information which topics should be further consolidated.