Link Analysis Search Engine
Who is linking to a site or page
What they are saying about site / page
No. of links is the important factor
Links from high authority sites is the most crucial factor
For example, you are interested in sites about dog grooming. Search engine can use semantic analysis to identify the collection of web pages that focus on the topic of dog grooming.
The search engines can then determine which of these sites about dog grooming have the most links from the set of dog grooming sites. These sites are most likely more authoritative on the topic than others.
The actual analysis is a bit more complicated than that. For example imagine that there are five sites about dog grooming with a
lot of links from pages across the web on the topic as follows:
Site A has 213 topically related links
Site B has 192 topically related links
Site C has 203 topically related links
Site D has 113 topically related links
Site E has 122 topically related links
Assume that Site A,B,D and E linked with each other but none of them are linked with site C.
In this scenario, site C is definitively not authoritative because it is not linked to by the right sites.
This concept of grouping sites based on their relevance is referred as a link neighbourhood.