The European Commission considers the data protection laws in that country or territory ensures an adequate level of protection for data subjects.
To date, only the following have passed the test: Andorra, Argentina, Canada (for commercial organisations), Switzerland, Faroe Islands, Guernsey, Israel, Isle of Man, Jersey, New Zealand and Uruguay.
In addition, a transfer to a US company that has been certified under the EU-US Privacy Shield Framework will be regarded as legal under the GDPR. The list of companies that are certified under the Privacy Shield can be searched on the Privacy Shield website.