The ETA will be valid for multiple entries.

When will the ETA go into effect?

Then on April 2, travelers from European countries will similarly be required to apply to enter theUK.

Regent Street in London

A red double-decker bus driving along Regent Street in London.Credit:Alexander Spatari/Getty Images

How much will it cost?

An ETA costs 10 ($12.51) to apply and is linked to a travelers passport.

How often will it be required?

How do you apply?

Travelers can apply either through a mobile app foriOSor throughGoogle Play, oronline.

Each person must apply separately, and decisions are typically offered within three working days or less.

Travelers who apply through the app are more likely to get a faster decision.

What information will be required for an tool?

Who is exempt from paying the fee?

Does the U.S. have anything similar?

What about visiting the rest of Europe?