What is ethernet

Last updated: April 1, 2026

Quick Answer: Ethernet is a widely used technology for connecting computers and devices in a local area network (LAN) using cables and network equipment like switches and routers.

Key Facts

Overview

Ethernet is a technology that connects computers and network devices together to share data and resources within a local area network (LAN). It is the most common standard for wired networking in homes, offices, and data centers worldwide. When you plug a network cable (also called an RJ-45 cable) into your computer or router, you are using Ethernet to establish a connection.

How Ethernet Works

Ethernet works by dividing data into small packets and transmitting them through cables to connected devices. Each device on an Ethernet network has a unique Media Access Control (MAC) address that identifies it. When one computer sends data, Ethernet uses a protocol called Carrier Sense Multiple Access with Collision Detection (CSMA/CD) to manage traffic and prevent data collisions on the network.

Types of Ethernet

There are several types of Ethernet distinguished by their speed and cable types:

Advantages of Ethernet

Ethernet provides stable, high-speed connections compared to wireless technologies. It has lower latency, making it ideal for gaming, video streaming, and professional work. Ethernet networks are also more secure since physical access to cables is required to intercept data, and they don't require constant battery power for wireless radio transmission.

Ethernet vs. WiFi

While Ethernet requires physical cables, WiFi is wireless and more convenient for mobile devices. However, Ethernet typically offers faster and more reliable speeds, making it the preferred choice for stationary devices like desktop computers, printers, and smart TVs. Most modern homes and offices use a combination of both technologies.

Related Questions

What is the difference between Ethernet and WiFi?

Ethernet uses physical cables for wired connections with typically faster speeds and lower latency, while WiFi is wireless and more convenient. Ethernet is more secure and reliable for stationary devices, whereas WiFi is better for mobile devices and portability.

What does the RJ-45 connector do?

The RJ-45 connector is the standard plug used to connect Ethernet cables to devices like computers, routers, and switches. It has 8 pins that carry electrical signals to transmit data across the network.

How fast is Gigabit Ethernet?

Gigabit Ethernet transmits data at 1,000 Megabits per second (1 Gbps), which is about 10 times faster than Fast Ethernet. This speed is sufficient for most home and office networks.

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Sources

  1. Wikipedia - Ethernet CC-BY-SA-4.0
  2. IEEE - Ethernet Standards CC-BY-4.0