Serach engine
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This document discusses search engines, including their basics, types, advantages, and disadvantages. It defines a search engine as a tool that helps retrieve information from the internet by indexing websites and building databases. When a query is entered, the search engine checks its index and returns relevant matches. The document outlines different types of search engines such as general, meta, subject-specific, and deep web search engines. It also lists advantages like quickly searching vast information and saving time, and disadvantages like information overload, privacy concerns, and inability to index the entire web.
Serach engine
- 2. CONTENTS • BASICS OF INTERNET ? • BASICS OF SEARCH ENGINE • WHAT IS SEARCH ENGINE ? • FUNCTIONING OF A SEARCH ENGINE • TYPES OF SEARCH ENGINE • ADVANTAGES • DISADVANTAGES • CONCLUSION
- 3. BASICS OF INTERNET • Anybody can publish anything on the internet. • Contents and features of sites change very fast. • No bibliographic control on published information. • Try out multiple sites while looking for information. • Subject directories and search engines vary in their contents. • Good source to locate scholarly literature.
- 4. BASICS OF SEARCH ENGINES • Store million of pages in their databases. • Search features/scope vary greatly from one to another. • Good for beginners and experts. • Search for particular types of documents ,file types etc. is possible • Search for any kind of information is possible. • Different search facility is available for sites, images , news , audio/video files , maps etc.
- 5. WHAT IS SEARCH ENGINE ? • Search engine is a tool , which helps in retrieving information from the internet. • It indexes the web and accordingly builds it’s databases. • Each search engine has it’s own set of rules to index websites. • When the query or keyword is entered in the search box it checks it’s ‘index’ with the query. • Relevant matches are retrieved and returned as ‘hits’ or ‘search results’.
- 6. FUNCTIONING OF A SEARCH ENGINE
- 7. TYPES OF SEARCH ENGINES • General Example: Bing , Google , Gigablast etc. • Meta search Engines Example: Dogpile • Subject Specific search engine Example: Scirus,Intute,Enterz,GopubMed • Intelligent/Specialiased search engines. Example: Kosmix,WolframAlpha • Deep Web/Invisible Web Example: Library catalouges,Databases • Scholarly literature Example: Google Scholar,Base ,Oaister etc.
- 8. ADVANTAGES • Makes a quick search to vast amount of information from one search box. • Search the specific type of information. • It saves time.
- 9. DISADVANTAGES • Creates information overload. • Semantic search is not possible. • Privacy and security is of concern. • Makes everyone to dependent. • Can not index the entire web. • Can not index sites governed by passwords and developed using frames.
- 10. CONCLUSION Search engine is a great technology although it has some limitations but we can improve it and we should use it wisely.