The Electronic Travel Authorisation service (ETA) at airports in Sri Lanka is now going to resume, according to the government of Sri Lanka. The service is for fully vaccinated international travellers and is a way to make things easier on international travellers.
The controller general has however made it clear to travel operators that online ETA should be encouraged for incoming travellers so that there aren't any delays at the airport.
The validity of Sri Lanka’s ETA is limited to 30 days, but this can be extended to up to 6 months. The ETA is basically a more reliable, efficient, and simplified service for incoming travellers. According to the official website of Sri Lanka’s ETA service, no passport copies, documents, or photographs are required for this process.