What is a SWITCH ?

A network Switch is a networking device that connects devices together, these devices could be, computers, printers, other switches, routers or even firewalls and servers..

It uses a technique that is called packet switching to receive, process and forward data to the destination

Unlike less advanced network HUBS a network switch forwards data only to one or multiple devices that need to receive it, rather than broadcasting the data out of each of its interfaces.

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A network switch contains multiple ports and is considered as a network bridge that uses Hardware addresses or MAC addresses, to process and forward data at the link layer from layer 2 of the OSI model

Some switches can also process data at the network layer which is LAYER 3, and that happens by additionally incorporating routing functionality that most commonly uses IP address to perform packet forwarding. This kind of switches is known as LAYER 3 switches.

A Switch is a device that connects other devices, multiple data cables are plugged into a switch to enable communication between different network devices.

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Switches manage data flow across a network by sending a received network packet only to one or more devices on which the packet is destined.
Each network device connected to an adapter can be identified by its network address, allowing the switch to regulate traffic flow, which increases the security and efficiency of the network.

A switch is smarter than a HUB, which simply retransmits packets out of every port, which makes a broadcast domain that can affect the network stability. A HUB is unable to distinguish different recipients.

Also, Switches may operate at one or more layers of the OSI model including the data link and network layers.

There are too many manufacturers of switches in networking:

Cisco