> For the complete documentation index, see [llms.txt](https://u.naturaldao.io/solidity/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://u.naturaldao.io/solidity/intro.md).

# 1.1 智能合约简介

### 1.1.1 智能合约定义

智能合约是一种旨在以信息化方式传播，验证和执行合同的计算协议。智能合约允许在没有第三方的情况下进行可信交易，这种交易一旦执行不可逆转。

Nick Szabo在1990年代就提出了智能合约的概念。

智能合约意味着它必须被写成是计算机可读的代码。合约由参与方达成协议，一旦写成，就会由计算机或计算系统自动执行。

### 1.1.2 智能合约意义

虽然Nick Szabo在近二十多年前就提出了智能合约的概念，但实际上在实践中一直没有具体的落地应用和成功范例，没有如何将这个概念转换为现实的清晰路径。直到近些年，准确地说是具有图灵完备功能的以太坊出现后，才真正让智能合约出现落地应用的案例。


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