The article explores how search engines use links between web pages to determine relevance for search queries. They found that using link information from top search results significantly improves search performance. The researchers studied the English Wikipedia to understand the value of link evidence for information retrieval. By analyzing the link graph of the entire collection and top search results, they discovered that local link evidence is crucial for improving search accuracy. This approach led to significant performance enhancements in ad hoc search tasks on the Wikipedia collection.