A router.
static network
Hierarchical Networks
This is called a Wide Area Network or the Internet.
ISPs (Internet Service Providers) acts as Gateway to Network of Networks called Internet for Customers.
WAN ( Wide Area Network )
It's just a definition which means that your ipod touch uses the network by default. Even if there are couple available networks the ipod will try to connect to the default network.
Local Area Network
LAN- Local area network
OTHER NETWORK who are they? how do i hack there internet?
It's commonly called a 'network server'
Gateways
internet