Ethereum is an open and decentralized blockchain platform that lets anyone build and use decentralized applications (a.k.a DAPP) and smart contracts using a crypto asset called Ether.
...
Many have come to believe that an open, trustless blockchain platform like Ethereum is perfectly suited to serve as the shared “back end” to a decentralized, secure internet - Web 3.0. An internet where core services like DNS and digital identity are decentralized, and where individuals can engage in economic interactions with each other.
Ethereum vs Bitcoin
...
See also
...