SUSE Linux Enterprise Server (SLES)

SUSE Linux Enterprise Server (SLES) is a fiercely agile, highly robust, and deeply integrated enterprise operating system based in Europe. It operates as the absolute, heavy-weight direct rival to Red Hat (RHEL) in the "Mission-Critical Enterprise Server" space. While RHEL dominates America, SUSE built a massive global empire by mathematically fusing itself perfectly to massive SAP databases. The absolute core differentiator of SLES is its "Deep SAP HANA Optimization." If a massive global manufacturer (like BMW or Airbus) is running their entire multi-billion dollar business on a massive, in-memory SAP HANA database, they do not use Ubuntu. They use SUSE, because SUSE and SAP mathematically engineered the OS together to maximize memory performance. Because it completely dominates the massive European enterprise landscape, offering unparalleled high-availability clustering, deep SAP synergy, and massive Btrfs file system snapshots, it is heavily favored by global manufacturing, massive European banks, and SAP-centric conglomerates.