域名点击率（CTR）
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域名点击率衡量用户点击搜索结果的频率相对于其显示次数的比例。URL中显示的域名和[[tld|TLD]]直接影响CTR：.com等知名TLD通常比陌生扩展名获得更多点击，而富含关键词的域名则可通过匹配用户意图提升点击量。Google将CTR作为排名信号，形成正向循环：[[tld-trust-signal|受信任]]的域名获得更多点击，从而提升排名，进而赢得更多点击。
示例
In an A/B study, the same page at 'tools.com' achieved 34% CTR vs 21% for the identical page at 'tools.xyz', illustrating how TLD recognition affects click behavior.