SLD（二级域名）
Embed This Widget
Add the script tag and a data attribute to embed this widget.
Embed via iframe for maximum compatibility.
<iframe src="https://tldfyi.com/iframe/glossary/sld/" width="420" height="400" frameborder="0" style="border:0;border-radius:10px;max-width:100%" loading="lazy"></iframe>Paste this URL in WordPress, Medium, or any oEmbed-compatible platform.
https://tldfyi.com/glossary/sld/Add a dynamic SVG badge to your README or docs.
[](https://tldfyi.com/glossary/sld/)Use the native HTML custom element.
SLD（二级域名）是域名中位于[[tld|TLD]]直接左侧的部分。它通常是[[registrant|注册人]]在[[domain-registration|注册]]时选择的独特品牌化部分。
示例
In 'example.com', 'example' is the SLD. Some ccTLDs have functional SLDs like 'co' in example.co.uk.