In services.msc you get a description: takes care of file and printer sharing and the likes. Otherwise you look for "what does windows server service do?"

you can also do tasklist /svc in a command prompt to get a list of svchosts.exes, pids and the services they are running.

Yup. I wondered what the PS equivalent was. So, figure out which WMI class one needs:

    Get-CimClass | ?{$_ -match 'service'}

ok, 'Win32_service' it is, could've guessed that :) Then:

    $svc - Get-WmiObject -Class Win32_service

what can we do with this?

    $svc | Get-Member

Lots of options, get some to see if it's what is needed:

    $svc | Select-Object -Property Name, PathName, ServiceType | Format-Table

Ok, looks like we need PathName. Sum up and list svchost processes including full descption like the one in services.msc:

    $svc | ?{$_.PathName -match 'svchost.exe'} | Select-Object -Property Name, PathName, Description | Format-Table

Or even easier, in the process manager. Just right click -> Go to Service.

That just tells you the service name; i.e. 'Server', which doesn't tell a lot in this case. services.msc has a more elaborate description.