Adobe xd to xml?

Question

Adobe XD

Hello, I'm new to android development (I've been developing for 3 months already). I want to ask you a question, what is adobe xd and why do mobile applications need it at all? When I saw it, I thought that the design was created directly and somehow automatically converted into xml, but I don’t know if this is true and I saw that I need to change xd to xml on my own, well, in short, I still don’t understand what it is in general and what it is eaten with . Tell me please.