A Schengen visa is required for most foreign nationals living in the USA traveling to one of (or all of) the twenty-six European countries make up the Schengen Union. The issuance of a Schengen visa allows travel across neighboring country borders without requiring a unique visa from each country. US-based foreign nationals must apply for their Schengen visas in the US at specific consulates and almost without exception a personal appearance by the applicant is required.
Tourist Visas are issued to travelers who wish to do sightseeing, visit friends, social or public events. No paid activity should be performed during tourist visit. Visa to Luxembourg is NOT required for USA citizens.