To visit Luxembourg, travelers generally need a visa unless they are from a Schengen Area country or a visa-exempt nation. Visa types include short-stay (Schengen), long-stay, and work visas. The application process requires submitting a completed form, valid passport, photos, travel itinerary, proof of accommodation, travel insurance, and visa fees to a Luxembourg Embassy or Consulate. Processing times can vary, so it's advisable to apply well in advance of your planned travel date.