Cues is a newer lineup from Shimano. It replaces Alivio, Acera, and Altus groupsets, along with 10 and 11 speed Deore. It also gets some trickle down tech from XT/XTR like Shadow and a clutch for the rear derailleur. Shimano also claims that approx 40% of entry to mid level bikes will have Cues installed. Just to name a few changes and benefits that Cues is getting from higher end components.

Here's a good article in detail on Cues that I found.

https://flowmountainbike.com/post-al...rain-groupset/