What is GPRS?

"What is General Packet Radio Service?"

I was asked this question recently by my friend. This site has a good intro to GPRS, only that it was written in January 2000.

But a small bit on the differences between browsing the net over GSM & GPRS based on my experiences:
1) GSM gives me 9.6 kbps but GPRS gives me 57 kbps
2) GSM costs me for the duration I am connected, GPRS costs for the actual data I transfer (up/down both)
3) GSM is like a normal dial-up connection over the POTS, GPRS is like a LAN connection to an APN.