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    <p>There's a fairly good article here: <a href="https://web.archive.org/web/20130904073403/http://www.ibm.com/developerworks/library/wa-lucene/" rel="noreferrer">https://web.archive.org/web/20130904073403/http://www.ibm.com/developerworks/library/wa-lucene/</a></p> <p>Edit 12/2014: Updated to an archived version due to the original being deleted, probably the best more recent alternative is <a href="http://lucene.apache.org/core/3_6_2/fileformats.html" rel="noreferrer">http://lucene.apache.org/core/3_6_2/fileformats.html</a></p> <p>There's an even more recent version at <a href="http://lucene.apache.org/core/4_10_2/core/org/apache/lucene/codecs/lucene410/package-summary.html#package_description" rel="noreferrer">http://lucene.apache.org/core/4_10_2/core/org/apache/lucene/codecs/lucene410/package-summary.html#package_description</a>, but it seems to have less information in it than the older one.</p> <p>In a nutshell, when lucene indexes a document it breaks it down into a number of terms. It then stores the terms in an index file where each term is associated with the documents that contain it. You could think of it as a bit like a hashtable.</p> <p>Terms are generated using an analyzer which stems each word to its root form. The most popular stemming algorithm for the english language is the Porter stemming algorithm: <a href="http://tartarus.org/~martin/PorterStemmer/" rel="noreferrer">http://tartarus.org/~martin/PorterStemmer/</a></p> <p>When a query is issued it is processed through the same analyzer that was used to build the index and then used to look up the matching term(s) in the index. That provides a list of documents that match the query.</p>
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    1. POHow does lucene index documents?
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    1. COThanks for your answer and links . But i heard that Lucene project has a special stemmer named "Snowball"? Do you heard anything about that ?
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      1. USMehdi Amrollahi
    2. COThis is a different question: See http://www.lucidimagination.com/search/out?u=http%3A%2F%2Fwiki.apache.org%2Flucene-java%2FConceptsAndDefinitions Other than that, seeing your question pattern I suggest you read the 'Lucene in Action' book: http://www.manning.com/hatcher2/ (First edition is a bit dated, but can be found in a dead tree version. The second edition can be bought as an e-book).
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      1. USYuval F
    3. COMay you modify you answer, the first link which is an IBM link is not found :)
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      1. USAdelin
 

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