In macOS, many applications are distributed as application bundles that appear as a single .app file in the Applications folder. Because the app’s executable and supporting resources are contained inside that bundle, uninstalling is often as simple as moving the .app bundle to the Trash. Quentin Docter explains that an APP file ends in .app and is a container holding the executable plus resource files/folders, and he describes the uninstall process as selecting the application in the Applications folder and choosing File → Move to Trash, which removes it from the operating system’s available apps list. The All-in-One guide also states that for most non–App Store macOS apps, removal is typically done by dragging the app to the Trash, with uninstallers only sometimes provided for larger apps. Mike Meyers’ Lab Manual reinforces this: “other software can be removed…by simply dragging the app to the Trash.” By contrast, .msi and .exe are Windows installers, .rpm is a Linux package format, and .pkg is a macOS installer package (not what you trash to uninstall).