Android is a software framework developed by Google, Inc., that serves as an operating system, middleware, and an application platform for numerous smart devices globally. It is widely used on various smartphone models and has become a predominant mobile OS.
The iPhone is a popular portable phone that also serves as a web browser, camera, and music and video player developed by Apple Inc.
A Personal Digital Assistant (PDA) is a handheld computing device used primarily for managing personal information such as an address book and scheduler. PDAs have largely been supplanted by smartphones, which offer more advanced features.
Research In Motion (RIM) is a Canadian technology company best known for developing the BlackBerry line of smartphones and tablets.
