Teaching is the process by which a person helps other people learn. It is one of out most important activities. Teaching helps people gain the knowledge and attitudes they need to be responsible citizens, earn a living, and lead to a useful, rewarding life. Teaching also provides the chief means of passing knowledge on to the next generation. It there were no teachers, people would have to learn everything by themselves. Few people could learn enough on their own to get along in the world. The world itself would change greatly as mankind lost the knowledge, skills, and ideals inherited from past generations.