Virtual private servers (VPS) and cloud servers (cloud virtual machines) are both virtual servers created based on virtualization technology, but there are some important differences between them. Here are the main differences between them:

　　Hardware resource allocation method:

　　VPS: A VPS is usually created by using virtualization technology on a physical server. In this case, a physical server's resources (such as CPU, memory, and storage) are divided into multiple virtual servers, with each VPS running independently. This means that the performance of the VPS is affected by other VPS on the physical server.

　　Cloud servers: Cloud servers are also created through virtualization, but they are usually run within a larger cloud infrastructure. This enables cloud servers to dynamically allocate resources based on demand, making them more elastic and less susceptible to the performance of other cloud servers.

　　Scalability:

　　VPS: VPS usually offer limited scalability options. Resource allocation is often static and difficult to scale up or down quickly.

　　Cloud server: Cloud server provides more flexible scalability. You can increase or decrease resources as needed without restarting the server, which makes it easier to deal with traffic spikes and fluctuations in demand.

　　Billing party

　　VPS: VPS is usually billed according to a predetermined plan, and you pay a fixed fee regardless of whether you use all the resources.

　　Cloud server: Cloud server usually adopts the on-demand billing model. You only pay for the resources actually used. This flexible billing method is suitable for users with different needs.

　　High availability and fault tolerance:

　　VPS: VPS usually does not have high availability and fault tolerance. If the physical server fails, the VPS may be affected.

　　Cloud server: Cloud servers are usually built on high-availability cloud infrastructure and are fault tolerant. If a physical node fails, the cloud server can automatically migrate to another available node to maintain service continuity.

　　Management and control:

　　VPS: VPS typically offer fewer automation and self-service management options and require more manual intervention.

　　Cloud server: Cloud server usually provides rich management and monitoring tools, allowing users to easily manage and expand their virtual machines.

　　In short, choosing a VPS or a cloud server depends on your needs and budget. If you need greater resiliency, high availability, and flexible billing options, cloud servers may be a better choice. But if your resource needs are relatively stable and your budget is limited, VPS can also be an affordable option.