Different types of resins??

Hello! I've been looking into the casting process, and I think I'm having a language problem! All the tutorials and comments talk about resin, but stores here have four kinds:

• Epoxy resin
• Poliurethane resin
• Polyester resin
• Acrylic resin

I'm sure it's super obvious but I don't know what's the difference, what resin is that everybody is using???

 

:O oh my gosh thank you!! I was looking at a completely wrong section then u_u