Much of who we are as individuals has to do with our interactions; with others, with ourselves and indeed with the world around us. In fact our whole environment depends on interaction; Atoms interact to make molecules, which interact to make compounds. Complex organic molecules interact to make simple cells, which are the basis of life itself. Our bodies are collections of cells
which are interdependent, working together to create the whole.
Similarly in life we cannot exist alone. We are totally dependant on the relationships around us to survive. But further than this, on a social level, it is our interaction with others that help us thrive.