The term in the context of ReVanced does not refer to a standalone executable like a Windows portable app. Instead, it indicates a build that:
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Google’s Play Store uses DPI splits to save bandwidth. Instead of sending one giant APK containing images for every screen size, Google sends you only the images your phone needs. For example, a xxhdpi APK contains high-resolution icons and UI elements but lacks low-resolution ones. youtube revanced dpi or nodpi portable