Understanding how a wireless bridge works help.

I get what it dose... but I am a bit confused.

When we have a wireless bridge is everything on the same network. for example 192.168.1.0 /24?

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or is this more like some kind of wireless routing? ie both routers would have be a separate networks

ie 192.168.1.0 and 192.168.2.0 with information being routing between them?

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