Bridge Function, also known as "Bridging," refers to the process of forwarding network packets based on the Link Layer addresses defined by the OSI network model. This function operates at the Data Link Layer of the OSI model. Common networking devices such as switches and bridges inherently possess bridging capabilities. A bridge connects two distinct physical Local Area Networks (LANs), serving as a storage-forwarding device at the Link Layer for LAN interconnectivity.To put it simply, the Bridge Function enables two wireless routers to be connected through wireless means to form a single network. If there is a need to link two routers into the same network, one would activate the Bridge Function. If such a connection is not required, the function remains disabled.The use of Bridge Function is applicable in scenarios where an existing wireless router does not provide sufficient coverage or signal strength throughout a home. In such cases, purchasing an additional wireless router and setting up a wireless bridge between them can extend the wireless signal, ensuring certain areas have adequate WiFi access.Upon successful bridge setup, the secondary router also gains internet connectivity, thus enhancing overall wireless signal strength. However, it is essential that the primary router remains connected to the internet. If the primary router is not online, the secondary router will also not have internet access after the bridge is established.References:Bridging -百度百科