Search Engine revealed

When we want results about some keywords, we type in Google for that and Google shows some result according to similarity of the phrase, so search engines provide results for given phrases.

Search engines match queries against an index that they create. The index consists of the words in each document, plus pointers to their locations within the documents. This is called an inverted file. A search engine or IR system comprises four essential modules:

  • A document processor
  • A query processor
  • A search and matching function
  • A ranking capability


Types of Search Engines:

  • Crawler-Based Search Engines e.g Google ,yahoo
  • Directories e.d Dmoz
  • Hybrid Search Engines e.g Google
  • Meta Search Engines e.g Metacrawler
  • Specialty Search Engines e.g Fashion search ,Investment Search etc



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