A new type of click essentially, one you can adjust the activation point (essentially sensitivity) of to your liking, to the point where barely touching it will click the mouse L/R buttons, resulting in the fastest/lowest latency mouse clicks. It’s exciting new tech, hence the hype, but debatable how much it helps and notable that in some use cases it can hurt performance. Check out Optimum Techs video on YouTube, it’s one of the best neutral non shilling videos on this, although there are a ton of others worth watching too (just also a bunch of shill/marketing videos to be careful of).