Use made of to talk about the material of an object – wood, plastic, glass, crystal, etc.
– which has not gone through very much processing. You can still see the original
material:
▶️ This table is made of wood.
▶️ The window is made of glass.
▶️ This shirt is made of cotton.
Use made from to talk about one object that came from another, different object:
▶️ This purse is made from recycled plastic bags.
▶️ Cheese is made from milk.
▶️ Wine is made from grapes.
In each of these cases, you can’t see the original materials anymore (plastic bags,
milk, or grapes); they have been transformed into something completely new.