Final answer:
Android allows the use of various application sources, Android devices have larger screen sizes on average, Android devices support NFC technology
Step-by-step explanation:
A difference between Android and iOS operating systems is that Android allows the use of various application sources, while iOS has more restricted access to applications and primarily relies on the Apple App Store.
Another difference is that Android devices have larger screen sizes on average compared to iOS devices. While there are varying screen sizes in both operating systems, Android devices tend to offer a wider range of screen sizes to suit different user preferences.
Lastly, Android devices support NFC (Near Field Communication) technology, which enables contactless transactions and data transfers, while NFC is not as widely supported on iOS devices.