Amazon Web Services is a subsidiary of Amazon.com that provides on-demand cloud computing platforms to individuals, companies and governments, on a paid subscription basis.
Microsoft Azure is a cloud computing service created by Microsoft for building, testing, deploying, and managing applications and services through a global network of Microsoft-managed data centers
DigitalOcean, Inc. is an American cloud infrastructure provider headquartered in New York City with data centers worldwide.
Docker is a computer program that performs operating-system-level virtualization also known as containerization. It is developed by Docker, Inc.