router

What is a router ?

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Generally, it is a device to connect the personal computer, smartphone, etc. at home or company to the Internet. Technically, it is a device for connecting different computer networks.
  • It is an essential device for internet connection.
  • It is often confused with the “modem” used to connect the Internet from a telephone line such as ADSL.
  • A communication device for connecting different computer networks.
  • The main role of a router is to build a network, connect multiple PCs to the Internet, assign private IPs, and increase security.

Wikipedia

A router[a] is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. Data sent through the internet, such as a web page or email, is in the form of data packets. A packet is typically forwarded from one router to another router through the networks that constitute an internetwork (e.g. the Internet) until it reaches its destination node.

Quated from Wikipedia