什么是公有云部署模型？

Public cloud, also known as external cloud, is a form of cloud computing that involves a third party providing end customers with access to the computing resources they require, such as servers, applications, and storage space, through the Internet. The provider runs them from its own data centers; the AWS Cloud, for example, spans 39 geographic regions as of October 2026. Public cloud services are usually billed on a ‘pay-as-you-go’ basis.

主要的 云部署模型 包括公有云、私有云和混合云。每种模型都针对特定用户群体的需求和要求。公有云提供共享资源以实现成本效益，私有云提供专用资源以增强控制，而混合云则结合两者以实现灵活性。最适合您组织的模型取决于安全、预算和期望的控制级别等具体要求。

Public cloud differs from on-premises infrastructure by ownership, payment structure, flexibility, assistance, and openness. Above all, while public cloud resources are owned and run by the third-party CSP, on-premise resources are owned and run by the actual company. This results in variations in costs, scalability, and responsibilities.

In this multi-tenancy model, each customer’s data and applications remain isolated (Microsoft Azure). However, in public cloud environments, data is stored across multiple servers in data centers owned and managed by cloud service providers (CSPs), where users lack direct control over these servers and 具备 less control over the underlying infrastructure compared to on-premises solutions.

When considering 云部署模型, the public cloud is applicable for scenarios involving fluctuating demand, such as websites with variable traffic, development and testing setups, and offsite data storage.

Some of the leading public cloud solutions include AWS, Azure, and GCP. The AWS Cloud spans 39 geographic regions as of October 2026 (AWS). Public cloud services fall into three models:

• 基础设施即服务 （基础设施即服务）： Virtual machines, storage, as well as networking.
• 平台即服务 （平台即服务）： 用于应用程序开发和部署的云端解决方案。
• 软件即服务 （SaaS）： Applications stored 在 the cloud (such as Salesforce, Dropbox, and others).

Visit AWS, Azure, and GCP websites to look for more information on the options tailored to your organization’s needs.