LAN is a local area network and designed for small areas like an office, group of buildings, or a factory. LANs are used widely because it is easy to design and to troubleshoot. The PCs and the workstations are connected through the LAN.
LAN has different topologies, these are Star, Ring, Bus, Tree, etc. LAN is simple and used in connecting two computers, to share files and network among one another while it can also be as complex as interconnecting a whole building.
WAN is a wide area network that can be private or it can be public leased. It’s used for the network that covers large distances like cover states of a country. Networks that cover a large city or metropolitan area also can be included in this category.
More info: Social Engineering Attack Techniques
