The file svchost.exe is the Generic Host Process for Win32 Services used for administering 16-bit-based dynamically linked library files (DLL files) including other supplementary support applications.
As operating systems became more complex Microsoft decided to run more software functionality from a dynamic link library (DLL) interface. However DLLs are unable to launch themselves and require at least one executable program, i.e. svchost.exe, is needed to bridge between the library process and the operating system.
Through the solitary file svchost.exe, the DLLs efficiently contain and dispense Win32 services as well as neatly facilitate the execution of svchost.exe’s own operations. Acting as a host, the file svchost.exe creates multiple instances of itself. The multiple executions of the file svchost.exe contribute to the stability and security of the operating system by reducing the possibility of a crashing process that causes a domino effect on its neighbor processes, thereby creating a system-wide crash in the machine.