Teaching and learning are interconnected because one cannot occur without the other. One has to learn before he or she can teach (pass on) the knowledge gained to another individual. For example, teachers go to teachers' college to learn how to teach other people. Another example of the connection between teaching and learning is: you cannot teach someone if there is no one who wants to learn, and if you yourself have not learned anything you cannot teach someone else.
Teaching and learning are also connected because every day we learn something from interactions with people around us or by observing our environment and it is what we have learnt that we consequently teach those around us who are willing to learn. Additionally, when you are able to teach what you know to someone else it confirms or verifies that you have fully learnt and understand the topic or subject matter. So, teaching leans on learning and thereby both are connected in facilitating the education process.