What's the difference between "be made of" and "be made from"?
"be made of" You can tell the material when you look at the thing.Ex. The desk is made of wood."be made from"You cannot tell the material when you look at the thing.Ex. Butter is made from milk.Is this explanation correct ?

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Made from
We often use made from when we talk about how something is manufactured:
Plastic is made from oil.
The earliest canoes were made from tree trunks.

Made of
We use made of when we talk about the basic material or qualities of something. It has a meaning similar to ‘composed of’:
She wore a beautiful necklace made of silver.
A:
What’s this table made of?
B:
It’s oak, American white oak.
A:
It’s lovely.