This Belkin unit is for USB only, makes your printer accessible via Bluetooth. There are also DLink, Ambicom, Epson and other brands. Some of them are a complete kit, some are just the unit that plugs into the printer and you need a Bluetooth adapter for the PC.
There are also some rarer units that can be used with parallel port printers, but since parallel ports are disappearing few companies make products for them.
You could also have a print server set up, if you were using a wireless network. The print server would be a wireless unit that is connected via cable to the printer, and you communicate over the wireless LAN with it just like if it was a PC with shared printer, or a networked printer. Of course the Bluetooth option is simpler.