Fast Ethernet is a term used to describe a set of networking standards that allow for data transmission speeds of 100 megabits per second (Mbps). It is an enhancement of the original Ethernet technology, which operated at 10 Mbps. Fast Ethernet supports various physical media, including twisted pair cables and fiber optics, making it versatile for different networking environments. Introduced in the mid-1990s, Fast Ethernet is commonly used in local area networks (LANs) to connect computers and devices efficiently. It maintains compatibility with older Ethernet standards, allowing for easy upgrades without replacing existing infrastructure.