Whether a visa is needed for Singapore depends on the nationality of the traveler. Most nationalities can enter Singapore without a visa for short stays, but all travelers must apply for a Singapore Arrival Card online before arrival. Entry requirements generally include a passport issued within the last ten years, proof of onward or exit travel, and sometimes a yellow fever vaccination certificate. Visa-required nationals must apply for a visa in advance, but some may be eligible for a Visa-Free Transit Facility for stays under 96 hours. It is important to check specific visa requirements based on citizenship and travel purpose before planning the trip.