Elastic IP (ElP) is a static IP designed for dynamic cloud computing and a fixed public IP in a certain region. With EIP, you can quickly map an address to another CVM instance or NAT gateway instance in your account to avoid instance failure.
You can keep an EIP in your account until it is released. Unlike a public IP, which can only be released with the CVM, an EIP can be decoupled from the CVM lifecycle and operated independently as a cloud resource. Therefore, if you need to retain a public IP strongly related to your business, you can convert it into an EIP and keep it in your account.
For the common operations of EIP, please see: