A desktop computer is designed so that the system unit, input devices, output devices, and any other devices fit entirely on or under a desk or table.
A personal computer is a computer that can perform all of its input, processing, output, and storage activities by itself.
A netbook is another type of notebook computer (laptop) but it is smaller, lighter and often not as powerful as a traditional computer.
A portable media player is a mobile device on which you can store, organize, and play digital media.
A mobile computer is a personal computer you can carry from place to place.
A digital camera is a device that allows users to take pictures and store the photographed images digitally, instead of on traditional film.
A smart phone is a phone that can connect to the Internet and usually also provides personal information management functions.
A mobile device is a computing device small enough to carry place to place.