Teachers and learners are together in the teaching and learning process, but we will not have good learning outcomes if we do not support them to continue improving their knowledge and the best way to do it is giving feedback to students to they realize the points where they need reinforcement and practice. That is motivation for our students because it shows the teacher is worried about their students and their progress; feedback can be given orally or written, but the content is the same with the objective is the same, "improving". Feedback is used for both: formal and informal assessment, that means that in any activity done in class is a good opportunity to offer feedback, but we should know how to give feedback to our students in an encouraging and constructive way and not as making they feel ashamed in front of the others. Feedback is not only one- way directed from teachers to students, it could also be given from students to teachers eliciting feedback form our students to know their interests and we improve as educators looking for topics that are suitable form them if we did not get our students' attention using boring or uninteresting topics in class. Therefore, feedback is one of the main stages that we should adapt into our class if we want our students keep learning and improving.
I attach a link with a really useful PDF document filled with more information from this unit that would be useful for teachers: