A local area network (LAN) is a computer network that interconnects computers within a limited area such as a residence, school, laboratory, university campus or office building. By contrast, a wide area network (WAN) not only covers a larger geographic distance, but also generally involves leased telecommunication circuits .

Most common types of LAN currently still in use:

• Ethernet
• Wi-Fi

Source: https://en.wikipedia.org/wiki/Local_area_network