The foreach loop executes against each element of a collection using the following notation:

foreach (<element> in <collection>) { 
    <body-statements> 
} 

For example, the foreach loop may be used to iterate through each of the processes returned by Get-Process:

foreach ($process in Get-Process) { 
    Write-Host $process.Name 
}

If the collection is $null or empty, the body of the loop will not execute.