What is "User Profile Service" in my Windows 7 service list? And how is "User Profile Service" service related to ProfSvc.dll?

"User Profile Service" is a Windows 7 service that "This service is responsible for loading and unloading user profiles. If this service is stopped or disabled, users will no longer be able to successfully logon or logoff, applications may have problems getting to users' data, and components registered to receive profile event notifications will not receive them." "User Profile Service" service is provided by ProfSvc.dll DLL file.

Detailed information on "User Profile Service" service:

Service name: ProfSvc
Display name: User Profile Service
Execution command: C:\Windows\system32\svchost.exe -k netsvcs
Start type: Automatic
Service status: Started
Dependencies:
   Remote Procedure Call (RPC)

"User Profile Service" service is provided by a DLL file called: ProfSvc.dll:

Name: ProfSvc.dll
Location: C:\Windows\System32\ProfSvc.dll
Description: ProfSvc
File version: 6.1.7601.17514
Size: 160 KB (164,352 bytes)
Modified: Saturday, November 20, 2010, 7:20:57 AM

Disabling "User Profile Service" service may cause issues when running Windows 7 system.

⇒ "Windows Management Instrumentation - wmisvc.dll" Service on Windows 7

⇐ "Themes - themeservice.dll" Service on Windows 7

⇑ 'svchost.exe -k netsvcs' Services on Windows 7

⇑⇑ Windows 7 Services Tutorials