An Ethernet cable is typically used for networking to connect devices within a local area network (LAN). It facilitates wired communication between devices, such as computers, printers, and routers, enabling data transfer at high speeds. Ethernet cables come in various categories, such as Cat5e, Cat6, and Cat6a, which determine bandwidth capabilities and data transmission rates. They are essential for establishing stable and reliable network connections in home and office environments, supporting applications like internet access and file sharing.