That&#x27;s correct--  Swift&#x27;s native String&#x2F;Array&#x2F;etc. are part of Swift&#x27;s native stdlib.<p>NSString&#x2F;NSArray and friends (along with the bridging code to go between them and the Swift stdlib types) are part of the open-source Foundation, though.  Eventually, that should be present in any reasonably complete Swift runtime environment--  it includes APIs, like networking and date&#x2F;time handling, that would typically be considered essential but aren&#x27;t part of Swift&#x27;s stdlib.