As people, we come together in many ways and for many reasons. One of these being to direct our collective efforts toward common goals. We formalize this "joining together" by creating organizations, families, communities, recreational teams, networks, etc.
The creation of these collective cultures allows our group efforts to be directed towards achieving something that none of us could accomplish alone.
These collective cultures are often born out of one person's passion (the leader) and the implementation of this passion by others (the followers).