Resolved Why multiple node.exe and svchost.exe in Task Mgr

svhost.exe is a Windows program and multiple services can run under a single process of svhost.exe. But Windows has a gagillion services. It is unsafe to kill an instance of that process. To see which services are running under a svhost,exe process use Process Explorer, a Windows utility, free as well.

node.exe is a process that runs applications which use node.js, a javascript runtime environment. Many apps, cloud software, chat, email apps, etc. are built using node.js and on Windows you'll see node.exe processes running. Process Explorer should help you identify which apps are using node.exe too.

Because more than one app can use one of those single processes at the same time. When a program is closed another app may still be using that process.