A multi-IP server refers to a server configured with multiple IP addresses on one physical server. Usually, a server has only one IP address, but by using virtualization or network technology, multiple IP addresses can be assigned to the same server, thus realizing multiple IP servers.

Multi-IP server has the following characteristics and advantages:

1. High availability: Multiple IP servers can provide services on different IP addresses. When one of the IP addresses is unavailable, other IP addresses can still work normally. This increases server availability and reliability and can reduce the risk of service interruptions.

2. Load balancing: Multi-IP servers can distribute traffic to different IP addresses through load balancing technology, thereby balancing the server load. By distributing requests in a balanced manner, the performance and response speed of the server can be improved to ensure that the services on each IP address run in a balanced manner.

3. IP isolation: Each IP address can be independently configured and managed to achieve isolation between different services or applications. This is useful for scenarios where multiple independent services or applications need to be deployed, keeping them independent and secure from each other.

4. Support multiple domain names or websites: Multi-IP servers can provide independent IP addresses for different domain names or websites, which is very convenient for users who need to host multiple websites or domain names. Each domain name or website can have its own IP address, providing greater flexibility and administrative control.

5. Support multiple SSL certificates: Multi-IP servers can configure independent SSL certificates for each IP address, which is very important for scenarios where HTTPS encrypted connections need to be enabled for multiple domain names or websites. SSL certificates on each IP address can be managed independently, ensuring security and isolation.

It should be noted that multi-IP servers need to be selected according to actual needs and application scenarios, and the use and configuration of IP addresses should be reasonably planned. At the same time, configuring and managing multiple IP servers may require certain technical knowledge and experience. It is recommended to learn about related technologies and best practices in detail before using it.