A default gateway is a router or network device that serves as an access point to another network, often the internet, when no other route is specified for a given data packet. In other words, it is used to forward traffic from the local subnet to different subnets, including external networks. When a host needs to communicate with a device on a different subnet, it sends the traffic to the default gateway, which then routes the traffic accordingly.
References:
Cisco DevNet Associate Certification Guide
Cisco Networking Essentials, Chapter on Routing and Switching Basics
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