Travel to and through the UK & Northern Ireland

1. Purpose: An ETA is generally for short-term stays, such a trip or transit through the country. It allows visa-exempt nationals to enter a country without needing a full visa. A visa, on the other hand, can cover a wide range of purposes, including long-term stays, work, or study, and usually requires a more detailed application process.

2. Application Process: The ETA application process is typically quicker and simpler than that of a visa. ETAs are applied for online, require less documentation, and are often processed in a matter of days. Visa applications, however, may require an in-person interview, more extensive documentation, and can take weeks or months to process.

3. Duration of Stay: An ETA usually grants permission for short visits, typically for 90 days or less, while a visa can allow for longer stays depending on the type (e.g., work, study, or residency visas).

4. Eligibility: ETAs are available to citizens of countries that are typically visa-exempt, allowing them to travel without obtaining a full visa. A visa is required for citizens of countries that do not qualify for visa exemptions or for individuals wishing to stay for longer or different purposes, such as work or study.

In summary, an ETA is a quicker, more streamlined travel authorization meant for short-term visits, while a visa is more comprehensive and may be required for longer stays or specific activities such as employment or study.