2 Answers
Cloud Native generally refers to something designed to use cloud services. As opposed to something migrated or retrofitted.
– https://en.wikipedia.org/wiki/Cloud_native_computing
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I actually found similar answer on azure site :
Cloud native applications are built from the ground up—optimized for cloud scale and performance. They’re based on microservices architectures, use managed services, and take advantage of continuous delivery to achieve reliability and faster time to market.