I've been wanting to talk about this for a while, and finally had some time today to put my thoughts together.
In 1998, Nick Szabo proposed a decentralized digital currency called “bit gold,” but it was never actually implemented.
The original idea behind smart contracts was to turn contractual terms into programs that execute automatically once the agreed-upon conditions are met, reducing reliance on third parties.
Ethereum, where $ETH is located, brought the concept of smart contracts into widespread practice.
If there's anything I missed, let's chat in the comments.

#ETH

This data is for reference only—don't take it too seriously.