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The Web 1.0 was a static kind of web that only allows images and text. It was not programmable.
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Smarts contracts are smal pieces of code that can run in Ethereum network. They allow you to program actions -programmable assets and money- dynamically. It pushes blockchain to another level.
3.Ethereum code brings transparency further thanks to the smart contracts. Smarts contracts make commercial relantionship trustless, as everything. every step, has to be clearly defined and eventually executed. Immutability goes further including under which circumstancies and how a tx has to be executed.