BLuetooth
It is a type of WPAN technology. Spread spectrum technology provides wireless links between devices and allow it to connect to the internet. You can create small home networks with bluetooth. Some examples include transferring photographs from device to device. It essentially functions as a mini-LAN.
WAN
It is formed by LANs connected through a router or a modem. It functions as an ISP with a much more enhanced security. Some additional hardware that are required for a WAN are: routers,modems,and proxy servers.