云 computing, in simple terms, is sharing resources on-demand over the internet. These resources include infrastructure but also software, 平台, 存储, 数据库, and development environments.
云 computing and 虚拟化 are often confused, but in simple terms 虚拟化 is about technology whereas cloud is about applications, 部署模型, and a move from CAPEX to OPEX. 虚拟化 allows one physical server in your 数据中心 to run several individual computing environments. 虚拟化 technology is fundamental to cloud computing and has many benefits, including the optimal use of your hardware investments.
云 providers have 数据中心 full of virtualized servers enabling each cloud customer to work with a virtual instance of the same software. While cloud computing and 虚拟化 maximize your IT resources and can possibly cut costs, cloud services can provide additional benefits particularly for small to medium sized companies by granting access to applications and solutions otherwise out of financial reach.
在一般情况下, cloud computing is a more cost effective solution, especially for small and mid-size companies. Due to the shared infrastructure, there are fewer up-front costs and investments in hardware, software and maintenance. 这是运营成本v. 资本支出决策.
云 enables a wide range of applications and services that many businesses could not normally afford. This provides opportunities for innovation that can help companies stay competitive.
While reliability is a concern, the reality is that software-as-a-service (SaaS) providers deliver products that are typically more reliable and secure than a small business could maintain itself in-house.
With an ever increasing mobile workforce, the cloud enables a flexible platform for your employees to work remotely, run applications while at a client site, or check-in on projects from anywhere in the world.
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In some ways transitioning to being a cloud-based business is easy, however some aspects are complex and need an experienced team to fit the pieces together. 云 computing can be a catalyst for business model innovation, fundamentally shifting competitive landscapes by providing a new platform for creating and delivering business value.
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server and application 虚拟化
虚拟化 is the fundamental technology powering cloud computing, increasing ROI and application availability while reducing downtime, 运营成本, and support resources. While the two are interrelated they are very distinct IT solutions.
Types of 云 Services
Software-as-a-Service (SaaS) lets you subscribe to applications and use them over the internet. Platform-as-a-Service (PaaS) allows you to create custom applications, and Infrastructure-as-a-Service (IaaS) provides a backbone with pay-as-you-go services.