Gigabit refers to a data transmission speed of 1,000 megabits per second (Mbps), or one billion bits per second. It is the standard measurement for modern broadband internet connections and local network speeds.
In practice, gigabit connections appear in two main contexts. First, gigabit broadband (sometimes called gigabit fibre) is an internet service tier offered by many providers in the UK, capable of delivering download speeds up to 1,000 Mbps. Second, gigabit Ethernet is a networking standard used in routers, network switches, and devices to transfer data between your home equipment at very high speeds.
A real-world example: if your router has gigabit Ethernet ports and your internet package supports gigabit speeds, you could theoretically download a 1 GB file in around 8 seconds. In reality, you rarely achieve maximum theoretical speeds due to network overhead, distance from the router, and other devices using the connection.
When shopping for broadband or networking equipment, look for gigabit-rated ports and subscriptions if you regularly transfer large files, stream 4K video, or run multiple connected devices. Older equipment may only support 100 Mbps (Fast Ethernet), which creates a bottleneck if your broadband speed exceeds that threshold. Checking whether your router, modem, and cables all support gigabit speeds ensures you get the performance you are paying for.