Some of the most common forms of mobile computing devices are as follows.
- portable computers, compacted lightweight units including a full character set keyboard and primarily intended as hosts for software that may be parametrized, as laptops, notebooks, notepads, etc.
- mobile phones including a restricted key set primarily intended but not restricted to for vocal communications, as cell phones, smart phones, phonepads, etc.
- Smart cards that can run multiple applications but typically payment, travel and secure area access
- wearable computers, mostly limited to functional keys and primarily intended as incorporation of software agents, as watches, wristbands, necklaces, keyless implants, etc.
The existence of these classes is expected to be long lasting, and complementary in personal usage, none replacing one the other in all features of convenience.
Other types of mobile computers have been introduced since the 1990s including the:
- Portable computer (discontinued)
- Personal digital assistant/Enterprise digital assistant (discontinued)
- Ultra-Mobile PC (discontinued)
- Tablet computer
- Wearable computer
- Application-specific computer
see more: https://en.wikipedia.org/wiki/Mobile_computing