How does FTL or fast travel work in your setting?

I'm especially curious in the case of fantasy settings. I'm admittedly not super well read in the genre, I know about the Ways from the Wheel of Time series[^1] , and I'm sure D&D has its fair share of fast travel mechanics.

Anyway, in my case I use mass routers. Rather than a dry lore dump here's a slightly less dry lore dump in story form!

[^1]: fun fact: the Ways inspired the Nether from Minecraft insofar as one step in one dimension is multiplied in the overworld