In Windows, what does svchost.exe do?

Open the Process Manager of the Windows system and you will see many svchost.exe processes, but you don't know what these processes are, and some viruses and Trojans use them.

Svchost.exe =SErVICEHost
Some services depend on one or some DLL files, and svchost.exe is used to call those DLL files when the system starts to start those services, that is, the host of these services.

For example, which service hosts are svchost.exe? Which services are related to svchost.exe? This helps us determine if it is a virus or Trojan.
Open cmd. This article is completed in the Vista system.
Run the c: \> tasklist/svc command.
Are all process-related services listed?
What if I want to see all the services related to svchost.exe?
C: \> tasklist/svc/fi "imagename EQ svchost.exe"

For more details about the tasklist command, run c: \> tasklist/? In cmd /? To view.