Daily Cuts - What is an ETA and why are more countries like Thailand implementing it?

From December, visitors to Thailand will need a mandatory electronic travel authorisation (ETA) for travellers from some 93 visa-exempt countries, including Singapore. But what is an ETA, why do we need one when we’re already visa-exempt, and why are more countries implementing it? Andrea Heng and Hairianto Diman get an explainer from a travel expert, Aaron Wong, Founder, travel website The MileLion, plus what you’ll need to prepare for future travels.