Svchost.exe is Service Host. Many of components of the Windows operating system are implemented as services for programs that run in the background and aren’t necessarily associated with whomever is logged into the machine. A fair number of those services are implemented in DLLs rather than in stand-alone executables. Since DLL can’t run on its own, svchost.exe is the one that loads the DLL.
%WINDIR%\system32\tasklist.exe /svc /fi "IMAGENAME eq svchost.exe"