The EU Council and the European Parliament have voted to allow U.K. citizens to travel without visas to Schengen Area countries for short stays. The Schengen Area consists of 22 EU member states, plus Norway, Liechtenstein, Switzerland and Iceland. Even in the event of a no-deal Brexit, a U.K. citizen can stay in any Schengen Area country without a visa for a total of 90 days out of the 180 days that begin on the day of entry into the country. The visa exemption requires reciprocity from the U.K.; if the U.K. introduces a visa requirement for nationals from at least one of the Schengen Area countries, the EU will apply the Schengen Area's visa requirements to U.K. citizens, according to an EU official.
Updated April 10 at 5:25 p.m. Eastern to reflect that the EU governing bodies formalized the agreement by vote on April 4.