What's DX Engine

General
1

Cospaces use the DX engine?
what means DX?

2

DX stands for Delightex

3

Thank you a lot for your answer,

Cospaces is so fun!!
studing, and I will ask again thank you!

4

please answer me one more question.
What 's raycast, means in Python api?
It’s one of the namespaces,