What's link popularity?

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Link popularity is the number and quality of links pointing to a single URL. A site's home page usually has the highest link popularity because site owners tend to link to home pages rather than deeper content.

Click-through popularity used to a measure the number of clicks to a URL and how long a visitor stayed on a site after she clicked from an SERP (define). If she clicked on an SERP link and continued to view the site, she found the information she searched for and didn't need to return to the SERP to view other Web sites. However, if she clicked on an SERP link and quickly returned to the SERP, she didn't find the information she searched.

Due to the rise in click fraud, click-through popularity is now a less important factor in determining a page's relevancy. Now, when a search engine marketer (SEM) refers to link popularity, he means the number and quality of links pointing to a URL, not click-through popularity.