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Ethereum is a blockchain-based decentralized platform intended for running smart contracts. Smart contracts are bits of code stored on the blockchain that can read and write information and are activated by blockchain transactions. Various types of utilization will be tokenized as different standards, depending on what the application is intended to do.
Check for more information here: https://blog.kucoin.com/etheruem-ecosystem-guide-to-erc-tokens-sk-st