Personal digital assistant

PDAPDAspersonal digital assistantsdigital assistantpalmtoppersonal data assistantportable digital assistantcasedata organizerhand held computers
A personal digital assistant (PDA), also known as a handheld PC, is a variety mobile device which functions as a personal information manager.wikipedia
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Smartphone

smartphonessmart phonesmart phones
PDAs were largely discontinued in the early 2010s after the widespread adoption of highly capable smartphones, in particular those based on iOS and Android.
Early smartphones were marketed primarily towards the enterprise market, attempting to bridge the functionality of standalone personal digital assistant (PDA) devices with support for cellular telephony, but were limited by their battery life, bulky form, and the immaturity of wireless data services.

Psion Series 3

Series 3Psion 3-SeriesPsion 3a
The first PDA, the Organizer, was released in 1984 by Psion, followed by Psion's Series 3, in 1991.
The Psion Series 3 range of personal digital assistants were made by Psion PLC.

Psion (company)

PsionPsion PLCPsion Software Ltd
The first PDA, the Organizer, was released in 1984 by Psion, followed by Psion's Series 3, in 1991.
Formed in 1980, Psion achieved its first successes as a consumer hardware company that developed the revolutionary Psion Organiser as well as a whole range of more advanced, clamshell-design Personal Digital Assistants.

Touchscreen

capacitive touchscreentouch screenscreen
Sometimes, instead of buttons, PDAs employ touchscreen technology. However, some PDAs may not have a touchscreen, using softkeys, a directional pad, and a numeric keypad or a thumb keyboard for input.
They play a prominent role in the design of digital appliances such as personal digital assistants (PDAs) and some e-readers.

Mobile device

mobile deviceshandheldmobile
A personal digital assistant (PDA), also known as a handheld PC, is a variety mobile device which functions as a personal information manager.
Phones/tablets and personal digital assistants may provide much of the functionality of a laptop/desktop computer but more conveniently, in addition to exclusive features.

Psion Organiser

OrganizerOrganiser IIPsion
The first PDA, the Organizer, was released in 1984 by Psion, followed by Psion's Series 3, in 1991.
The Organiser II can be considered the first usable PDA in that it combined an electronic diary and searchable address database in a small, portable device.

IBM Simon

IBM Simon Personal Communicator, 1994Simon Personal Communicator
In 1994, IBM introduced the first PDA with full telephone functionality, the IBM Simon, which can also be considered the first smartphone.
The IBM Simon Personal Communicator (simply known as IBM Simon) is a handheld, touchscreen PDA designed and engineered by International Business Machines (IBM), and assembled under contract by Mitsubishi Electric.

Palm, Inc.

PalmpalmOnePalm Computing
Another early entrant in this market was Palm, with a line of PDA products which began in March 1996.
Palm, Inc. was an American company that specialized in manufacturing personal digital assistants (PDAs) and various other electronics.

Palm (PDA)

PalmPalm PilotPalm PDAs
Another early entrant in this market was Palm, with a line of PDA products which began in March 1996.
Palm (aka Palm Computing or Palm, Inc.) is an American tech company that developed and designed Personal Digital Assistants (PDAs), mobile phones, and software.

Calendaring software

calendarcalendaringcalendar application
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.
Calendaring is a standard feature of many PDAs, EDAs and smartphones and also of many office suites for personal computers.

Thumb keyboard

thumbboardthumb typingthumb-board
However, some PDAs may not have a touchscreen, using softkeys, a directional pad, and a numeric keypad or a thumb keyboard for input.
A thumb keyboard, or a thumb board, is a type of keyboard commonly found on PDAs, mobile phones, and PDA phones which has a familiar layout to an ordinary keyboard, such as QWERTY.

Calculator

pocket calculatorcalculatorselectronic calculator
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.
Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all personal digital assistant (PDA) type devices, the exceptions being a few dedicated address book and dictionary devices.

Internet

onlinethe Internetweb
Nearly all PDAs have the ability to connect to the Internet.
Hotspots providing such access include Wi-Fi cafes, where users need to bring their own wireless devices such as a laptop or PDA.

Graffiti (Palm OS)

GraffitiGraffiti input system
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. The strokes are often simplified character shapes, making them easier for the device to recognize. One widely known stroke recognition system is Palm's Graffiti.
Graffiti is an essentially single-stroke shorthand handwriting recognition system used in PDAs based on the Palm OS.

Nokia

Nokia CorporationNokia GroupNokia India
Then in 1996, Nokia introduced a PDA with telephone functionality, the 9000 Communicator, which became the world's best-selling PDA.
In 1998, Nokia co-founded Symbian Ltd. led by Psion to create a new operating system for PDAs and smart mobile phones as a successor of EPOC32.

Memory card

memory cardsflash memory cardmedia card
Although many early PDAs did not have memory card slots, now most have either some form of Secure Digital (SD) slot, a CompactFlash slot or a combination of the two.
These are commonly used in portable electronic devices, such as digital cameras, mobile phones, laptop computers, tablets, PDAs, portable media players, video game consoles, synthesizers, electronic keyboards, and digital pianos.

John Sculley

SculleyJohn Scully
The term PDA was first used on January 7, 1992 by Apple Computer CEO John Sculley at the Consumer Electronics Show in Las Vegas, Nevada, referring to the Apple Newton.
About that time, Sculley coined the term personal digital assistant (PDA) referring to the Apple Newton, one of the world's first PDAs.

Palm OS

PalmPalm Operating SystemPalm OS 5.2.8
HotSync Manager, for Palm OS PDAs
Palm OS (also known as Garnet OS) is a discontinued mobile operating system initially developed by Palm, Inc., for personal digital assistants (PDAs) in 1996.

Handwriting recognition

handwritinghandwriting recognizerautomatic recognition of hand-printed characters
Handwriting recognition, where letters or words are written on the touchscreen, often with a stylus, and the PDA converts the input to text. Recognition and computation of handwritten horizontal and vertical formulas, such as "1 + 2 =", may also be a feature.
On-line handwriting recognition involves the automatic conversion of text as it is written on a special digitizer or PDA, where a sensor picks up the pen-tip movements as well as pen-up/pen-down switching.

Pocket PC

PDA phonesPocket personal computerpocket-PC
Microsoft ActiveSync, used by Windows XP and older Windows operating systems to synchronize with Windows Mobile, Pocket PC, and Windows CE PDAs, as well as PDAs running iOS, Palm OS, and Symbian
A Pocket PC (P/PC, PPC), also known by Microsoft as a 'Windows Mobile Classic device', was a kind of personal digital assistant (PDA) that runs the Windows Mobile operating system.

Computer keyboard

keyboardkeyboardsalphanumeric keyboard
An external keyboard connected via USB, Infrared port, or Bluetooth. Some users may choose a chorded keyboard for one-handed use.
Smaller external keyboards have been introduced for devices without a built-in keyboard, such as PDAs, and smartphones.

Personal information manager

PIMpersonal information managementcontacts and calendaring
A personal digital assistant (PDA), also known as a handheld PC, is a variety mobile device which functions as a personal information manager.
This feature typically stores the personal data on Cloud drives allowing for continuous concurrent data updates/access, on the users computers, including desktop computers, laptop computers, and Smart devices personal digital assistants.

Data synchronization

syncsynchronizationsynchronize
Most PDAs can synchronize their data with applications on a user's computer.
It is fundamental to a wide variety of applications, including file synchronization and mobile device synchronization e.g., for PDAs.

Scroll wheel

mouse wheeltrackwheelscroll ball
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.
Scroll wheels can also be found on such handheld devices such as PDAs, portable digital audio players such as the original Apple iPod, or mobiles phones such as early Sony models and BlackBerry devices.

Nokia 9000 Communicator

90009000 Communicator9000i
Then in 1996, Nokia introduced a PDA with telephone functionality, the 9000 Communicator, which became the world's best-selling PDA.
The Communicator is formed of a clamshell design that opens up to reveal a monochrome LCD display with a 640x200 resolution and a full QWERTY keyboard similar to a Psion PDA.