Wireless printers allow a single printer to be networked by other computers on your wireless network, allows you to make a central location for all printer users, allows you to place the printer further from your computer without running USB cable or further than USB code allows. It does require a wireless router as the hub. Depends on what you want and need.
The most common method of wireless printing is to connect your printer to your home's Wi-Fi network. The advantage of this method--assuming you already have a Wi-Fi network--is that you shouldn't need much new equipment. A simple wireless router with a built-in USB, serial, or Ethernet port should do, depending on what type of printer you own. From that point, you simply connect the printer directly to the router, and then locate the printer on your Wi-Fi network. As a bonus, anyone on your Wi-Fi network can access the printer just like they do the Internet.
Wi-Fi isn't the only wireless technology, of course, as Bluetooth is also popular. However, it's hard to justify Bluetooth as a wireless printing technology for laptop and desktop computers when Wi-Fi has a much longer range and is easier to use. The best application for Bluetooth is when your computer and/or printer aren't capable of Wi-Fi networking, or when you're printing from mobile devices like cell phones, PDAs, or digital cameras.
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