Okay, for real, what is Glide?

Speed is a concrete thing you can see and measure on a disc.

Turn is unfathomable, but easily understandable from a "it goes left, straight, or right when thrown at speed" perspective.

Same thing with Fade, it's just how aggressively the disc is going to fight to the ground as it slows down.

...But I have yet to ever see a solid explanation of Glide. I've always had it explained to me as "how much of an airplane wing a disc is", which makes sense... Except people also use the Bernouli effect to explain how turn and fade work, so that seems counter to that explanation, not to mention that from a "what the disc does" perspective, it doesn't actually tell you anything?

The only useful explanation/advice I've ever heard of Glide is that it's going to more or less directly translate into how much the disc is affected by wind (i.e. you're going to get a lot more turn into a headwind with high glide, carried a lot further left/right by crosswinds whether you show the bottom plate or not, and... well, I don't know what it does in a tail, but I'm sure it's something). Outside of that, people tend to get really technical in ways that don't actually translate to knowledge or play, in my experience.

So... I ask you. What is glide? What does it do? What does having a good knowledge of that little number on the disc do to help your game?

Edit: As I read through these comments, I'm more convinced than ever that... folks do not know the answer to this question, much as they think they know the answer to this question.