A favored vacation spot for tourists looking for a combination of beaches, cultural and historical sites, the Sri Lanka ETA application system helps facilitate easy travel authorization procedures that make it easier for tourists to visit the island country without any hassles in the entry requirement process.
Is Sri Lanka ETA mandatory for transit passengers?

A transit ETA is required only depending on the layover period. If one wishes to transit through an airport in Sri Lanka where the layover period is less than 24 hours and one remains within the airport, there is no need to acquire a transit ETA. But if the layover period exceeds 24 hours or one plans to leave the airport, acquiring a transit ETA becomes mandatory. Some nationalities are eligible to get a 2-day transit ETA for free.
Can Sri Lanka ETA be used for work-related short visits?
Indeed, the Sri Lanka ETA Visa is applicable when the travel is related to business matters, but only if the application is made under the business ETA visa. The category of such a Sri Lanka ETA visa enables individuals to take part in business meetings, discussions, conventions, seminars, workshops, symposiums, and short-term training courses for a period of less than one month. It does not allow an individual to work, conduct business, or trade in any form.
What is the Best Time to Visit for Srilanka ETA travelers planning a holiday?

When it comes to visiting Sri Lanka, the best time would be highly dependent on your particular travel plan due to the two monsoon seasons in Sri Lanka. On average, the Best Time to Visit Sri Lanka ETA would be between December and April when you are planning to visit the south-west coast along with the hill stations in Sri Lanka. But when you are planning to visit the north-eastern beaches along with the northern culture sites, then the best season would be from May to September.