What Is a Network Switch? Explained

What a network switch is

A network switch is a device that connects multiple devices together on a local network and directs data between them efficiently. When computers, printers, servers, and other devices in an office or building need to communicate, they often connect to a switch, which makes sure data gets from the sending device to the right receiving device. The switch is a fundamental building block of wired networks, acting as the central connection point that lets local devices talk to one another.

What a switch does

A switch's main job is to forward data to the correct destination. When a device sends data, the switch examines where it is addressed and sends it only to the intended recipient, rather than to every device. It learns which devices are connected to which of its ports, building a map so it can deliver traffic precisely. This targeted forwarding keeps the network efficient, since data is not needlessly broadcast to devices that do not need it.

Switch vs. hub

A switch is a smarter successor to an older device called a hub. A hub simply repeated incoming data out to every connected device, regardless of the intended recipient, which was inefficient and caused congestion as networks grew. A switch, by contrast, learns the addresses of connected devices and sends data only where it needs to go. This intelligent, targeted delivery is why switches replaced hubs and became the standard for connecting devices on a local network.

Switch vs. router

Switches and routers are both networking devices but do different jobs. A switch connects devices within a single local network and directs traffic between them. A router connects different networks together, most importantly linking your local network to the internet, and directs traffic between them. In many homes, a single box combines both functions, but conceptually they are distinct: switches handle local device-to-device traffic, while routers handle traffic between networks.

Where switches are used

Switches are everywhere wired networks exist. In offices and buildings, switches connect all the computers, phones, printers, and servers. In data centers, large numbers of high-capacity switches connect the servers. Even home routers typically include a small built-in switch for the wired ports on the back. Any time multiple devices are connected by cables into one network, a switch is almost certainly directing the traffic between them behind the scenes.

Why it matters

The network switch is a foundational device in wired networking, efficiently connecting devices and directing traffic where it needs to go. Understanding it clarifies how the devices in an office or data center communicate, how a switch differs from a router and the old hub, and how local networks are built. For anyone curious about how networks actually move data between devices, the switch is an essential concept.

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See also: Router vs modem: what's the difference?, What is a VLAN? Explained simply.

Sources

• Network switch - Wikipedia

Published date reflects the original event date (2023-10-24). This article is original Skillo editorial written from the sources above; facts were verified in September 2026.