Humans eat the endosperm of the coconut plant. The endosperm is the white, fleshy part inside the coconut shell that we commonly refer to as "coconut meat." It's actually the seed of the coconut.

Here's a breakdown of the edible parts:

* Coconut meat: The white, fleshy endosperm. It can be eaten fresh, dried (as copra), or processed into milk, oil, and other products.

* Coconut water: The liquid inside the young coconut. It's a refreshing and nutritious drink.

* Coconut husk: The fibrous outer layer of the coconut. It can be used to make rope, mats, and other products.

* Coconut shell: The hard outer shell of the coconut. It can be used to make bowls, jewelry, and other crafts.

So, while different parts of the coconut plant have uses, it's primarily the endosperm that humans eat.