The Difference Between
The Internet & LAN
LAN, by definition, is a Local Area Network, it usually connects computers locally. This means you can only connect to a LAN which is local.
The Internet (Also called WAN) is a Wide Area Network, it spans a vast distance, in our case, many parts of the world are inter-connected.
The internet is much wider than LAN. LAN connects computers locally meanwhile WAN is around the world.