What term refers to a certificate allowing entry for short business or tourism stays within the Schengen Zone?

The term that refers to a certificate allowing entry for short business or tourism stays within the Schengen Zone is the Schengen Visa. This visa enables travelers to visit multiple countries within the Schengen Area for tourism, business, or family visits, typically for stays of up to 90 days within a 180-day period. It simplifies travel across the member states, as once a traveler holds a Schengen Visa, they can move freely between the countries without needing additional visas.

Other options, such as a regular Visa, may represent various types of permits for entry into different countries, but they do not specifically reflect the regulations and conditions of the Schengen Agreement. An Electronic Travel Authority pertains more to certain countries like Australia and does not relate to travel within Europe. An Immigrant Visa is designed for those seeking permanent residency, which is distinctly different from the temporary short stays allowed by the Schengen Visa.