What do spanish people call yogurt ?

What do spanish people call yogurt ??
I don't know Dannon other wise known as Danone ,what is this liquidy weirdness made out of? Why is it so liquidy what ever happened to Wallaby?

And Greek yogurt you know that organic good stuff? Here if you want non-liquidy yogurt and decent yogurt what they call Greek but not really Greek just what should be normal thick and regular or there is Activia which is ok. I must say that Greek and Activia are both bearably good!!