TeraBox is a consumer cloud storage service for keeping, syncing and sharing files online, with an emphasis on sending large files. It is offered through a website and mobile apps. It is a cloud service: your files are held on the provider's servers rather than on your own devices.
TeraBox is published by Flextech Inc., headquartered in Tokyo, Japan. Independent reviews mention a connection to China's Baidu and link the service's predecessor, DuBox, to storage in China; the vendor itself does not confirm this. The vendor does not state the storage location of your files, and its homepage offers no data processing agreement or GDPR statement. For personal or confidential data of European users, it is sensible to check the terms and the data location first.