网站404页面是什么？404页面优化对SEO的作用—

很多企业对404页面认知模糊，甚至网站出现大量报错页面也不做处理，殊不知404页面是SEO优化的基础细节，直接影响网站权重和用户体验。404页面是用户或搜索引擎访问网站无效、过期、删除链接时，弹出的错误提示页面，正规优化404页面，是企业网站运营的必备操作。
未设置404页面对网站危害极大。当网站存在大量失效链接，且无规范404页面时，搜索引擎蜘蛛抓取失败，会判定网站维护不规范、内容残缺，持续降低网站整体权重，导致整体排名下滑、收录异常。同时用户打开无效页面后，直接显示空白报错、乱码提示，用户看不懂、无法返回正常页面，只能直接退出，大幅提升网站跳出率，进一步影响SEO数据。
优质404页面能够优化用户体验，降低跳出率。定制化企业404页面，摒弃生硬的系统报错界面，采用简约美观的设计，搭配友好提示，告知用户页面不存在、已过期、链接错误，同时设置返回首页、产品中心、联系我们的跳转按钮，引导用户继续浏览网站有效内容，避免用户直接退出，有效留存访客。
规范404页面是清理死链、保护权重的核心手段。网站改版、删页产生的死链，通过404页面精准识别无效链接，配合百度站长平台提交死链，让搜索引擎快速清理无效页面，释放抓取配额，让蜘蛛优先抓取网站优质有效页面，提升整体收录效率。同时避免无效页面占用抓取资源，稳定网站整体权重。
404页面优化的核心注意事项必须牢记。第一，404页面必须设置**真实返回码**，禁止使用200正常状态码伪装，否则会被搜索引擎判定为作弊，产生大量重复页面；第二，404页面不要设置自动跳转，自动跳转容易触发违规机制；第三，页面设计贴合企业品牌风格，保持和官网统一的视觉调性，维护品牌形象。
简单来说，404页面虽小，但对网站权重、收录、用户体验影响巨大，是低成本、高收益的SEO优化细节，所有企业网站必须完善规范的404报错页面。
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网站404页面是什么？404页面优化对SEO的作用

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