Docker Hub is a registry service for container images, offering public and private repositories, team access management, automated builds and webhooks. Developers push images to it and pull them into build and deployment pipelines. It is provided as a hosted online service by Docker, Inc.
Docker, Inc. is a US company. Its privacy policy states that its offices are headquartered in the United States, with a mailing address in Palo Alto, California. As a US provider it can be subject to US legal process such as the CLOUD Act. The policy says information may be processed and transferred to the United States and other countries, and it cites the EU-US Data Privacy Framework and standard contractual clauses, as well as a Data Processing Agreement for organisations. European customers should check where their repositories are stored and the terms that apply to their account.