SUSE Linux Enterprise Server is a world-class, secure open source server operating system, built to power physical, virtual and cloud-based mission-critical workloads.

Designed for mixed IT environments, it offers best-of-breed performance with reduced risk of technological obsolescence or vendor lock-in.

SUSE Linux Enterprise Server (SLES) 12 is a modular, general-purpose operating system and runs on all major processor architectures. It is optimized to run on leading hypervisors and supports an unlimited number of virtual machine guests per physical system with single subscription, making it the perfect guest for virtual and cloud computing.

This is a "Bring Your Own Subscription" version of SLES.