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What is SVCHOST.exe in Task manager?

Many time we opend the task manager to see the performance of the machine we found that there is a Process called SVCHOST.exe is using some of the resources.
Svchost.exe is a generic host process name for services that run from dynamic-link libraries (DLLs).In General language its a Combination of many services in one file.
The Svchost.exe file is located in the %SystemRoot%\System32 folder. At startup, Svchost.exe checks the services part of the registry to construct a list of services that it must load. Multiple instances of Svchost.exe can run at the same time. Each Svchost.exe session can contain a grouping of services. Therefore, separate services can run, depending on how and where Svchost.exe is started. This grouping of services allows for better control and easier debugging.

Svchost.exe groups are identified in the following registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\WindowsNT\CurrentVersion\Svchost
Each value under this key represents a separate Svchost group and appears as a separate instance when you are viewing active processes. Each value is a REG_MULTI_SZ value and contains the services that run under that Svchost group. Each Svchost group can contain one or more service names that are extracted from the following registry key, whose Parameters key contains a ServiceDLL value:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Service

To view the list of services that are running in Svchost:


Click Start on the Windows taskbar, and then click Run.

In the Open box, type CMD, and then press ENTER.

Type Tasklist /SVC, and then press ENTER.

Tasklist displays a list of active processes. The /SVC switch shows the list of active services in each process.

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