On-Site SEO: are the things that you can do on your site, such as: HTML markups, target keywords, internal linking, site structure, etc.

站内(On - Site) SEO：能在你的网站上做的，比如：HTML标记，关键词，内部链接，网站结构，等等。

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As an example, an ID on an XHTML element is used for linking within a document — and this is similar to how an anchor name within an HTML document can be used for internal links.

例如，使用XHTML元素的ID在文档内进行链接——这种方式类似于在HTML文档中使用锚点名称进行内部链接。

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Your internal pages will not appear in the search engine index without the proper linking structure to internal pages for the spider to follow.

如果链接结构没有遵循规则，你的内部页面是不会被索引到的。

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