Windows Mobile is the brand name used by Microsoft along with the operating system and software applications developed for handheld computers. In other words, it is a compacted operating system that is merged with a suite of essential applications for mobile devices based on the Microsoft Win32 API. The operating system and applications of the Windows are embedded programs, which means that Microsoft licenses them to the companies that manufacture the handhelds build them into the devices that they manufacture.
Abbreviated as P/PC, a Pocket PC is a hardware specification for handheld-sized computer that runs the Microsoft Windows Mobile operating system and possess competence of modern desktop PCs. It is basically a device that fits in the palm of your hand, is powered by a rechargeable battery, facilitates users to send e-mails, store contacts, appointments, play multimedia files, games, and many more things. A Pocket PC is a Microsoft specification which sets various hardware and software requirements for mobile devices bearing the "Pocket PC" label.