What is isass.exe

In the process menu of task manager I found something called lsass.exe Is this a virus or Trojan? Thanks guys!
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More about what isass
  1. lsass.exe" is the Local Security Authentication Server. It verifies the validity of user logons to your PC or server. ...
  2. lsass.exe" is the Local Security Authentication Server. It verifies the validity of user logons to your PC or server. Lsass generates the process responsible for authenticating users for the Winlogon service. This is performed by using authentication packages such as the default, Msgina.dll. If authentication is successful, Lsass generates the user's access token, which is used to launch the initial shell. Other processes that the user initiates then inherit this token.

    Note: The lsass.exe file is located in the folder C:\Windows\System32. In other cases, lsass.exe is a virus, spyware, trojan or worm! Check this with Security Task Manager.

    Virus with same name:
    W32.Nimos.Worm - Symantec Corporation
    W32.Sasser.E.Worm (Lsasss.exe) - McAfee
    W32.HLLW.Lovgate.C@mm - Symantec Corporation
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