11/11/2016
Search Engine Internals
Crawlers
•A crawler is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "spider" or a "bot."
•A crawler is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "spider" or a "bot."
Indexers
•A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and the use of more storage space to maintain the extra copy of data.
Semantic
•Semantics is
the study of meaning. It focuses on the relation between signifiers,
like words, phrases, signs, and symbols, and what they stand
for, their denotation. semantics is the study of meaning that is used for
understanding human expression through language.
Search engine
•Definition: An internet-based tool that
searches an index of documents for a particular term, phrase or text specified
by the user.
•Common Characteristics:
•Spider, Indexer, Database, Algorithm
•Find matching documents and display them
according to relevance
•Frequent updates to documents searched
and ranking algorithm
Introduction of SEO:
•A web
search engine is a software system that is
designed to search for information on the World Wide Web. The search
results are generally presented in a line of results often referred to as
search engine
results pages.
•Search engines look through their
own databases of information in order to find what it is that you are looking
for…
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