ECS是指Elastic Compute Service的缩写，译为弹性可伸缩的云计算服务。 

云服务器 ECS 是一种弹性可伸缩的计算服务，助您降低 IT 成本，提升运维效率，使您更专注于核心业务创新。

其实简单理解就是向阿里云租用一台服务器，来部署自己的应用程序，满足自己的业务要求。

阿里云ECS产品介绍链接：https://www.aliyun.com/product/ecs

阿里云ECS帮助文档：https://help.aliyun.com/document_detail/25367.html

就是云服务器，一台虚拟机

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