What is casual matchmaking?

I pretty much entirely play ranked matchmaking. What exactly is the point of casual matchmaking? I wish it had an in game description. As far as I can tell, it matches you with anyone regardless of skill. Seems rather off putting.

When I want to quickly play a casual match, I go into casual matchmaking. It’s good for me, but I agree that the skill differences in matches can be quite frustrating sometimes. They could have a statistic for each player, like how many minutes they take to reach a certain number of points, for example. And with this database, the system could automatically determine the player’s skill level.

I think casual matchmaking really needs some serious thinking. Right now it is just a unbalanced ranked matchmaking. It needs to be a game mode that is easygoing and relaxed. and for that it needs to be less time consuming (and of course some other stuff that i can’t think of). Right now it can be take as much as an hour.
I was thinking maybe they make it deathmatch mode only?