Bluetooth
Bluetooth was widely touted as the next big thing, but the hype has fallen somewhat flat. It serves a very focused purpose--replacing cables in everyday devices. Bluetooth's direct predecessor is infrared, which we commonly use today to remotely control our electronic equipment and transfer data between mobile devices.
Bluetooth's advantage over infrared ports is that it doesn't require line-of-sight. In other words, you don't need to have the two devices aligned side by side. These days, Bluetooth is commonly found in mobile phone headsets, replacing traditional wired ones. The technology is also being used in PDAs for remote synchronization with other Bluetooth-enabled devices.
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