Ethereum is not just a cryptocurrency like ETH but a platform for smart contracts and decentralized apps.
Ether (ETH) on Ethereum can be divided into smaller units such as Gwei and Wei.
To interact with Ethereum, users need a wallet to hold keys, with options like MetaMask, Rainbow, MyEtherWallet, or Remix Wallet.
Ethereum has two types of accounts: EOAs controlled by individuals and Contracts controlled by deployed code. A simple smart contract, like a faucet, can be built to withdraw a small amount of ETH.