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.
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