Memory cards
Although many early PDAs did not have memory card slots, now most have either some form of Secure Digital (SD) slot or a CompactFlash slot. Although originally designed for memory, Secure Digital Input/Output (SDIO) and CompactFlash cards are available that provide accessories like Wi-Fi or digital cameras, if the device can support them. Some PDAs also have a USB port, mainly for USB flash drives.Some PDAs use microSD cards, which are electronically compatible with SD cards, but have a much smaller physical size.
Wired connectivity
While early PDAs connected to a user's personal computer via serial ports or another proprietary connection, many today connect via a USB cable. PDAs are not typically able to connect to each other via USB, as USB requires one machine to act as a "host," which isn't a typical PDA function.
Some early PDAs were able to connect to the Internet indirectly by means off an external modem connected via the PDA's serial port or "sync" connector,or directly by using an expansion card that provided an Ethernet port.
Wireless connectivity
Most modern PDAs have Bluetooth a popular wireless protocol for mobile devices. Bluetooth can be used to connect keyboards, headsets, GPS receivers, and other nearby accessories. It's also possible to transfer files between PDAs that have Bluetooth.
Many modern PDAs have Wi-Fi wireless network connectivity, and can connect to Wi-Fi hotspots.
All smartphones, and some other modern PDAs like the Apple iPod touch, can connect to Wireless Wide Area Networks, such as those provided by cellular telecommunications companies.
Older PDAs typically had an IrDA (infrared) port allowing short-range, line-of-sight wireless communication. Few current models use this technology, as it has been supplanted by Bluetooth and Wi-Fi. IrDA allows communication between two PDAs, or between a PDA and any device with an IrDA port or adapter. Some printers have IrDA receivers,allowing IrDA-equipped PDAs to print to them, if the PDA's operating system supports it. Most universal PDA keyboards use infrared technology because many older PDAs have it. Infrared technology is low-cost and has the advantage of being allowed aboard aircraft.
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