HP Linux Imaging and Printing is Hewlett Packard's software package with drivers and tools for HP's printers, scanners, and all-in-one devices.

Perhaps no. Almost all modern network printers, including those from HP, support driverless printing using the Airprint™ or IPP Everywhere™ standards. See the OpenPrinting setup tutorial. Driverless scanning is possible too, thanks to sane-airscan.