Tor bridges allow people to bypass blocking of Tor entry nodes and look more like normal traffic and less like Tor traffic, here is an example of how to set one up.
Oh interesting, thanks. Do you know how well that compares with Mullvad? I know Tor and them collaborate on the browser but I'm traveling right now and Mullvad's is definitely getting picked up by some routers
https://community.torproject.org/relay/setup/webtunnel/