A router is a networking device that forwards data packets between different networks based on IP addresses, using routing protocols to determine the most efficient path.

Elaboration:

A router connects multiple LANs (Local Area Networks) and WANs (Wide Area Networks) and directs network traffic. It analyzes data packets, determines their destination, and forwards them accordingly.

• Uses routing tables and protocols like OSPF, RIP, and BGP.
• Supports NAT (Network Address Translation) to enable multiple devices to share a single public IP.
• Provides security features like firewalls and VPN support.

Example:

A home router connects devices (laptops, smartphones, smart TVs) to the internet via Wi-Fi or Ethernet.