The American cloud server and VPS (virtual special server) are two different virtualization technology applications, which have some differences in some key terms.

　　1. Virtualization technology:

　　American Cloud Server: Cloud server is usually a server resource provided by virtualization technology on cloud computing platforms. They can use virtual machines (VM) or containers to allow users to dynamically adjust computing resources as needed.

　　VPS: VPS is achieved by virtually dividing multiple independent virtual servers on a physical server. Each VPS runs in an independent virtual environment, using virtualization software (such as KVM, OpenVZ, etc.) to achieve resource isolation.

　　2. Resource allocation:

　　American Cloud Server: Cloud servers usually provide more flexible resource allocation and dynamic telescopic functions. Users can adjust the computing resources as needed without stopping or restarting.

　　VPS: The resource allocation of VPS is static. Once allocated, it is usually necessary to restart to apply changes. Resources may also be affected by other VPS on the physical server.

　　3. Elasticity and scalability:

　　American Cloud Server: Cloud server has elasticity and scalability, and can dynamically increase or decrease instances according to demand. This makes them apply to the scene of flow fluctuations and changes in demand.

　　VPS: The scale of VPS is usually static, and virtual servers with specific specifications need to be selected and purchased in advance.

　　4. High availability:

　　American Cloud Server: Cloud servers are usually deployed in multiple data centers and have high availability. Cloud service providers usually ensure the continuity of the service through load balancing and backup mechanism.

　　VPS: The high availability of VPS depends on the specific physical server and network architecture, which may not be as flexible and powerful as the cloud server.

　　5. Service ecosystem:

　　American Cloud Server: Cloud servers are usually embedded in the cloud service ecosystem. Users can easily use various services provided by cloud services, such as storage, databases, and networks.

　　VPS: VPS usually only provides basic computing resources, and users need to allocate and manage other services by themselves.

　　6. Price model:

　　American Cloud Server: Cloud servers usually use the model of paying on demand, and users pay according to the actual usage.

　　VPS: VPS usually has a fixed monthly or annual cost. Users need to pay a fixed fee, regardless of the actual resource usage.

　　The United States cloud server and VPS have some differences in virtualization technology, resource allocation, elasticity, high availability and service ecosystem. One of them depends on the specific needs of users, and the needs of flexibility, scalability and service integration.