break can be used to break out of a loop or block. In this example, the script would break in the first if statement so that the second if statement is not invoked.

$foo = "xxx"
$bar = "world"

if ($foo -eq "hello") {
    Write-Host "foo equals hello"
}
else {
    Write-Host "foo does NOT equal hello - breaking out"
    break
}

if ($bar -eq "world") {
    Write-Host "bar equals world"
}
else {
    Write-Host "bar does NOT equal world - breaking out"
    break
}