Ethernet is a wired networking technology that uses physical cables to connect computers, printers, routers, and other devices to a local network or the internet. Unlike wireless connections, Ethernet transmits data through twisted-pair copper cables or fibre optic lines, delivering consistent speed and low latency.
The standard comes in several speeds. The most common in homes and offices today are Gigabit Ethernet (1000 Mbps) and 2.5-Gigabit Ethernet. Older Cat5 cables support up to 1 Gbps, whilst Cat6 and Cat6A cables can handle 10 Gbps or higher depending on distance and quality. Ethernet uses the RJ45 connector, a small rectangular plug found on network ports.
A typical real-world example: you connect a desktop computer to a router with an Ethernet cable. Data flows directly between the two without competing for airwaves with your mobile phone or WiFi speakers, so you experience faster downloads and uploads, plus less interference and dropout.
When buying a device like a NAS drive, gaming console, or streaming box, check whether it has an Ethernet port. If you work from home or game online, running Ethernet to your desk or television eliminates WiFi bottlenecks. You'll need appropriate cable length and quality (look for Cat6 or better for modern speeds), and both your device and router must support the same speed standard to benefit fully.