What is the main industry of Estonia?

The main industry of Estonia is information and communication technology (ICT). Estonia is a world leader in ICT, and the sector accounts for over 25% of the country's GDP. Estonia is home to a number of large ICT companies, including Skype, TransferWise, and Pipedrive. The country is also a popular destination for start-ups, and there are many incubators and accelerators that support the growth of new businesses.