Ad Sitelinks can appear in four different formats: three-line, two-line, one-line, and embedded: Three-line and two-line formats : Sitelinks are designed to trigger in situations where an ad provides the ideal answer for a search query. These ads are most likely to trigger on unique brand terms. One-line format : Sitelinks will trigger with more generic terms, but may also include brand terms. Embedded format : Sitelinks will trigger whenever your ad qualifies to appear above the search results and the text in your ad exactly matches one or more of your Sitelinks. Source : http://goo.gl/edG6y
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