Modern blockchains are fully pogrammable, like a PC.

Ethereum, released in 2015, … can run programs (known as smart contracts) that enable developers to build almost any application.
Compound, Maker and Uniswap
OpenSea, the largest NFT platform
Braintrust, a web3 talent marketplace
Upwork
Web3 platforms such as Audius, Sound.xyz and Royal
from:
The World Ahead 2022. The Economist.
February 24, 2022
https://www.economist.com/the-world-ahead-2022