You learn to interact with other people and how to share. You learn to care about what the other person thinks of you - as a child its very easy to come home in tears when someone has called you names. The next day you can be playing together as if nothing happened. Friendship - fills a need of every human being to belong, to have company, to want to be needed. To have the comfort of another human being to do things with and have many interests in common.
Friendship helps stop the loneliness and isolation that people all experience in their lives.
By having a friend you can have more laughter, fun and love in your life. Friends bring better health because they allow you to talk about your problems that may be bothering you, not keeping the problem inside your heart. They help offer a different perspective on what is going on. A friend can be someone you spend time quietly with by a river watching the sun dancing upon the water. A friend can be there for you to have fun with and be there in serious times as well.