General Packet Radio Service (GPRS) is a mobile data service available to users of GSM mobile phones. It is often described as "2.5G", that is, a technology between the second (2G) and third (3G) generations of mobile telephony.
It provides moderate speed data transfer, by using unused TDMA channels in the GSM network. Originally there was some thought to extend GPRS to cover other standards, but instead those networks are being converted to use the GSM standard, so that is the only kind of network where GPRS is in use. GPRS is integrated into GSM standards releases starting with Release 97 and onwards. First it was standardized by ETSI but now that effort has been handed onto the 3GPP.
The Wikipedia entry for the term GPRS can be found here
In the video below, PhoneUS demonstrates the Palm Treo 680 smartphone, a GSM/GPRS/EDGE quad-band world phone, is easy to use, slim and compact, yet packed full of features beyond its stellar phone capability, such as email, web browsing, messaging, multimedia, calendar, contacts and more.