elementary OS is a Linux distribution based on Ubuntu. Developed by elementary project
License: Open Source
Ubuntu Server brings economic and technical scalability to your datacentre, public or private. Whether you want to deploy an OpenStack cloud, a Hadoop cluster or a 50,000-node render farm, Ubuntu Server delivers the best value scale-out performance available. Developed by Canonical Ltd
License: Open Source
Ubuntu Server is designed for server environments with a focus on performance, security, and scalability, making it ideal for hosting applications, cloud services, and databases. In contrast, elementary OS is built for end-users looking for a beautiful and intuitive desktop experience, making it suitable for personal computing.