Newfag here. Trying to figure out Chainlink and Defi, I got banned for telegram for asking this question and the same goes saying for Reddit
Bitcoin is kind of like a tree, right? It has rings and stuff which can't be changed and you can open it up and look at the history and agree where all the rings are. And ethereum is kind of like the leaves. They're scattered around the branches off of the tree and have veins and shit on them for writing things on. But when you write on one, it copies over to all the other leaves. Which is good because if you look at 1 leaf you'll know that it is legit if it says the same things as the rest of the leaves.
So this is where Chainlink comes in. Chainlink is like a nigger jerking off on to the soil at the base of the tree. His cum is kind of like the external data which your bitcoin tree feeds to the ethereum leaves. So basically feeds the tree with stuff that it needs to give to the leaves which are asking for nutrients and stuff.
Hope this helps.