Mattt over at NSHipster explains two important abstractions on Apple platforms: bundles and packages.

Despite being distinct concepts, the terms “bundle” and “package” are frequently used interchangeably. Part of this is undoubtedly due to their similar names, but perhaps the main source of confusion is that many bundles just so happen to be packages (and vice versa).

So before we go any further, let’s define our terminology: …