Whatisasearchengine?Useofsearchengines?TypesofsearchenginesExamplesearchenginesPortalServicesDirectoryimplementationDirectoryimplementationTheAdvantages/DisadvantagesofDirectorysearchengineTheAdvantages/DisadvantagesofDirectorysearchengineImplementationofWebpagesearchengineRequirementsforWebPagesearchengines3.Fulltextsearchcapabilityshouldbeprovided4.RelevanceRankingmechanismshouldbeprovided5.SearchSpeedshouldbefastenough6.Searchfeatures;I.e.,evaluationpoints:Quality,speed,scale,robustness,features,DataGathererIssuesofRobotRobotIssuesDataPreprocessingRedundancyremovalRankingtheURLsDataPartitionIndexerIndexer-implementationissueIndexer-implementationissueQueryProcessingSearchCGIprogramsOutputcontrolInteractionPersonalizationServicetoolsResearchIssuesConclusion