Example: www.abercrombie.com is the official site of the brand, there you find the possibility of viewing new collections, and also change all the colors and mix them in a very interactive way, this allow customers to find an specific product size it and buy it, is like having the store in your computer screen. they give you a shopping bag!!!
G2C: is kind of e-business example in which citizens use internet to connect with government!
Example: www.dian.com.co is the duties and tax entity which allow citizens to pay their taxes.
C2C: Ebay is a place in which you as a consumer can reach other consumers!
Example: www.metrocuadrado.com is a real state portal in which consumers contact with other consumers to sell their houses or apartments.
P2P: Peer to Peer; allow users to share folders in between with out any intermediaries. NAPSTER, EMULE & ARES!
Example: Bitcomet is a torrent which uses a interchange protocol designes to interchange, the great thing of bitTorrent is that when many people is downloading some speceific folder insted of slowering it make it quicker, each node contributes to the distribution of the folder