What's the difference between "routing" and DIRECT routing?

In the mixer page you can have both options, but what are these and what for?
I get the first one is routing the channel to the speakers, but the optional direct routing is new to me.

Many thanks!

Just another 8 options to distribute signal. Handy for parallel compression, side chain feeding, external FX, analog summing, switching to different bus processing just for parts of a song…

Direct Routing has two modes (selectable globally or on channel basis, rightclick in the top DR rack bar or in Mix Console menu) - just one routing active or all together.

There’s actually a lot you can do with it. It’s a concept found in most analog desks (routing to multiple subgroups).