A display device is an output device for presentation of information in visual or tactile form (the latter used for example in tactile electronic displays for blind people). When the input information that is supplied has an electrical signal the display is called an electronic display.
Common applications for electronic visual displays are television sets or computer monitors.
A personal digital assistant (PDA) was a multi-purpose mobile device which functioned as a personal information manager. Following a boom in the 1990s and 2000s, PDAs were mostly displaced in the early 2010s by the widespread adoption of smartphones. In particular, smartphones based on iOS and Android took their place, causing a rapid decline in PDA usage.
A PDA had a flat-screen display; many later PDAs also had color displays, and instead of navigation buttons, resistive touchscreens; or even capacitive touchscreens. Most models also had audio capabilities, allowing usage as a portable media player, and also enabling some of them to be used as telephones. By the early 2000s, nearly all PDA models had the ability to access the Internet via Wi-Fi; these models generally included a web browser.
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