What is the role of North Atlantic Treaty Organization (NATO)?

• Protect and promote human rights in those countries
• Help each other if they come under attack and Maintain peace between all its members.
  Explanation:

  "NATO is a group of European and North American countries that have agreed to help each other if they come under attack. It also aims to maintain peace between all of its members."
• Promote free trade amongst those countries
• Promote free education and health services