Arguably, the biggest search engine in the planet. Large part of its success relies on minimalistic user interface and relevancy in search results using the concepts of PageRank 
â„¢ and LinkPopularity.
- Differentiators: Popularity ranking using PageRank â„¢, Indexes the first 101KB of a Web page, and 120KB of PDF’s and ~ before a word finds synonyms sometimes
- Results Ranking: Matching and ranking based on “cached” version of pages that may not be the most recent version and Fuzzy AND also invoked.
- Field limiting: link:, site:, intitle: and inurl:
Combined technologies of its acquisitions of Inktomi, Overture and providing a service that gives pre-eminence to the Web search engine over the directory .
- Differentiators: Shortcuts give quick access to dictionary, synonyms, patents, traffic, stocks, encyclopedia, and more.
- Results Ranking: Automatic Fuzzy AND.
- Field limiting: link:, site:, intitle:, inurl:, url: and hostname:
Ask.com search technology uses subject-specific link popularity to compute “authoritativeness” of a search result. The ExpertRank algorithm provides search results ordered through attempting to identify authoritative websites. As well as link popularity , subject-specific popularity is also considered.
- Differentiators: Subject-Specific Popularityâ„¢ ranking and Suggests broader and narrower terms.
- Results Ranking: Based on Subject-Specific Popularityâ„¢, links to a page by related pages.
- Field limiting: intitle:, inurl: and site:
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