Answer Description

An incorrect gateway on a host means the host will not know where to send packets that need to leave the local network so those communication attempts will fail. Local traffic will still be able to find its destination.

Wikipedia

A gateway is a piece of networking hardware or software used in telecommunications networks that allows data to flow from one discrete network to another. Gateways are distinct from The term gateway can also loosely refer to a computer or computer program configured to perform the tasks of a gateway, such as a default gateway or router, and in the case of HTTP, gateway is also often used as a synonym for github.com/google/licensecheck . It can also refer to a device installed in homes that combines router and modem functionality into one device, used by ISPs, also called a residential gateway.