An Electronic Travel Authorisation or Electronic Travel Authority is a kind of pre-arrival registration, which is not officially classified as a visa, required for foreign travellers to a country who normally do not require a visa under some circumstances. Different from a proper visa which the traveller normally has no recourse if rejected, if an ETA is rejected the traveller can choose to apply for a visa instead. Many countries require individuals who do not require a visa to enter to hold an Electronic Travel Authorisation instead.