Are there different categories of server virtualization?

Server virtualization has its own classification. Through systematic classification, it can make people more clear. Let's take a look at the simple classification of server virtualization.
1. Divided by implementation levels: hardware virtualization, operating system virtualization, and application virtualization.
2. Divide by application fields: server virtualization, storage virtualization, network virtualization, and desktop virtualization.
There are also things that are derived from certain categories and cannot be classified, such as CPU virtualization and file virtualization.