The Schengen Agreement is a treaty that allows people to travel freely across many European countries without needing to show their passport at each border. It was established in 1985 and has since expanded to include 26 countries, known as the Schengen Area. This agreement makes it easier for tourists and business travelers to move around Europe, promoting tourism and trade. Countries in the Schengen Area have agreed to share information about security and immigration, which helps keep everyone safe. While there are no internal borders, each country still controls its external borders, ensuring that those entering the area meet the necessary requirements.