PowerShell modules are stored in their module path. Module paths can be retrieved using an environmental variable $env:PSModulePath. To get a better view, we will split the variable path with a semicolon.
$env:PSModulePath -split ';' C:\Users\Administrator\Documents\WindowsPowerShell\Modules C:\Program Files\WindowsPowerShell\Modules C:\Windows\system32\WindowsPowerShell\v1.0\Modules
You can see the 3 paths above. Each path has Modules stored as per their scopes.
Documents Path: Modules are stored in this path when you provide the scope – CurrentUser while installing the module.
Program files path: Modules are stored in this path when AllUsers Scope is provided.
System32 path: It is the default path for the module. Whenever Microsoft updates any PowerShell version or module, it is installed on this location.