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Newer PDAs, such as the HTC HD2, Apple iPhone, Apple iPod Touch, and Palm Pre, Palm Pre Plus, Palm Pixi, Palm Pixi Plus,Google Android (operating system) include more advanced forms of touchscreen that can register multiple touches simultaneously.

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External keyboards may attach to the PDA directly, using a cable, or may use wireless technology such as infrared or Bluetooth to connect to the PDA. Specialized folding keyboards, which offer a full-sized keyboard but collapse into a compact size for transport, are available for many models. Many touchscreen PDAs support some form of external keyboard as well.

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Touchscreen PDAs intended for business use, such as the BlackBerry and Palm Treo, usually also offer full keyboards and scroll wheels or thumbwheels to facilitate data entry and navigation. Some find it frustrating and inaccurate, while others are satisfied with the quality of the recognition. One widely known stroke recognition system is Palm's Graffiti.Дespite rigorous research and development projects, end-users experience mixed results with handwriting recognition systems. The strokes are often simplified character shapes, making them easier for the device to recognize.

Stroke recognition allows the user to make a predefined set of strokes on the touchscreen, sometimes in a special input area, representing the various characters to be input.Recognition and computation of handwritten horizontal and vertical formulas, such as '1 + 2 =', may also be a feature. Handwriting recognition, where letters or words are written on the touchscreen, and the PDA converts the input to text.Some users may choose a chorded keyboard for one-handed use. An external keyboard connected via USB, Infrared port, or Bluetooth.Text is entered by tapping the on-screen keyboard with a finger or stylus. A virtual keyboard, where a keyboard is shown on the touchscreen.Typical methods of entering text on touchscreen PDAs include: The user interacts with the device by tapping the screen to select buttons or issue commands, or by dragging a finger (or the stylus) on the screen to make selections or scroll. Some touchscreen PDAs, including Windows Mobile devices, had a detachable stylus to facilitate making selections. Many of the original PDAs, such as the Apple Newton and Palm Pilot, featured a touchscreen for user interaction, having only a few buttons-usually reserved for shortcuts to often-used programs. PDAs with wireless data connections also typically include an email client and a Web browser.

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In order to have the functions expected of a PDA, a device's software typically includes an appointment calendar, a to-do list, an address book for contacts, a calculator, and some sort of memo (or 'note') program. However, some PDAs may not have a touch screen, using softkeys, a directional pad, and a numeric keypad or a thumb keyboard for input this is typically seen on telephones that are incidentally PDAs. Another early entrant in this market was Palm, with a line of PDA products which began in March 1996.ДЄ typical PDA has a touchscreen for entering data, a memory card slot for data storage, and IrDA, Bluetooth and/or Wi-Fi. The Communicator spawned a new category of PDAs: the 'PDA phone', now called ' smartphone'. Then in 1996, Nokia introduced the a PDA with full mobile phone functionality, the 9000 Communicator, which became the world's best-selling PDA. In 1994, IBM introduced the first PDA with full mobile phone functionality, the IBM Simon, which can also be considered the first Smartphone. The term PDA was first used on Januby Apple Computer CEO John Sculley at the Consumer Electronics Show in Las Vegas, Nevada, referring to the Apple Newton. Followed by Psion's Series 3, in 1991, which began to resemble the more familiar PDA style. The first 'PDA' was released in 1984 by Psion, the Organizer II. Most PDAs can access the Internet, intranets or extranets via Wi-Fi or Wireless Wide Area Networks.

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A PDA has an electronic visual display, enabling it to include a web browser, all current models also have audio capabilities enabling use as a portable media player, and also enabling most of them to be used as mobile phones. Nearly all current PDAs have the ability to connect to the Internet. PDAs are largely considered obsolete with the widespread adoption of smartphones. A personal digital assistant ( PDA), also known as a palmtop computer, or personal data assistant, is a mobile device that functions as a personal information manager.