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There are two servicing channels of Windows: LTSC (Long-Term Servicing Channel) and SAC (Semi-Annual Channel). 1903 or Windows Server, version 1903 is meaning the SAC server, oppositely, Windows Server 2019 is meaning the LTSC server. The SAC server only has the well known Core mode, which offers great advantages such as smaller hardware requirements, much smaller attack surface, and a reduction in the need for updates. The LTSC server support both GUI mode and Core mode.
The SAC server is not an "update" or "service pack" for LTSC. It's the current twice-yearly server release on the release track that is designed for customers who are moving at a "cloud cadence", such as those on rapid development cycles. This track is ideal for modern applications and innovation scenarios such as containers and micro-services. Each release in this track is supported for 18 months from the initial release. Get more from [Windows Server servicing channels: LTSC and SAC](
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