Along with other people who travel to the United States under Visa Waiver Program (VWP), Swiss citizens will soon have to apply for an ESTA (Electronic System for Travel Authorization) authorization to enter the U.S. This procedure will be mandatory from January 12, 2009, but can be done on a voluntary basis from August 1, 2008. For further information, please visit the website of the U.S. Department of Homeland Security (DHS).