Almost all PDAs have the ability to connect to the Internet. PDA has a visual electronic display, allowing it to include a web browser, all models are also audio capabilities allowing use as a portable media player, and allowing most of them to use as mobile phones. Most PDAs can access the Internet, intranets, and extranets via Wi-Fi or wireless WANs. Most PDAs using technology of the touch screen.
The first PDA was released in 1984 by Psion the Organizer. Followed by Psion Series 3 in 1991, which began to resemble more familiar PDA style. There was also a full keyboard. The term was first used PDA 7 January 1992 by CEO John Sculley of Apple Computer at the Consumer Electronics Show in Las Vegas, Nevada, referring to Newton. In 1994, IBM introduced the first PDA with full functionality for mobile phone, IBM Simon, which can also be regarded as the first smartphone. Then in 1996, Nokia introduced a PDA with full mobile phone functionality, the 9000 Communicator, which became the best-selling PDA in the world.
The Communicator has created a new category of PDA: the "PDA phone", now called "smart phone" Another participant at the beginning of this market was Palm, PDA with a line of products that began in March 1996.