The concept of exchange programs grew out of a desire for nations and their people to build bridges of understanding after World War II. Since then, the youth exchange movement has become well known and accepted in many countries throughout  the world. What makes youth exchange successful  is the unique way in which young people learn about other country and culture: by living as a member of a host family, not as a guest. The success of this formula has resulted in a global awareness of the positive impact of exchange,not only on relations among nations, but on the lives of hundreds of thousands of participants, their peers, schools, communities, and parents. Many of today's world, national, and local leaders have themselves participated in an exchange experience and can attest to its positive impact on their lives.