what is information retrieval?
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Information retrieval (IR) is the art and science of searching for information in documents, searching for documents themselves, searching for metadata which describe documents, or searching within databases, whether relational stand-alone databases or hypertext networked databases such as the Internet or intranets, for text, sound, images or data. There is a common confusion, however, between data retrieval, document retrieval, information retrieval, and text retrieval, and each of these have their own bodies of literature, theory, praxis and technologies.\n\nThe term "information retrieval" was coined by Calvin Mooers in 1948-50.\n\nIR is a broad interdisciplinary field, that draws on many other disciplines. Indeed, because it is so broad, it is normally poorly understood, being approached typically from only one perspective or another. It stands at the junction of many established fields, and draws upon cognitive psychology, information architecture, information design, human information behaviour, linguistics, semiotics, information science, computer science and librarianship.\n\nAutomated information retrieval (IR) systems were originally used to manage information explosion in scientific literature in the last few decades. Many universities and public libraries use IR systems to provide access to books, journals, and other documents. IR systems are often related to object and query. Queries are formal statements of information needs that are put to an IR system by the user. An object is an entity which keeps or stores information in a database. User queries are matched to documents stored in a database. A document is, therefore, a data object. Often the documents themselves are not kept or stored directly in the IR system, but are instead represented in the system by document surrogates.\n\nIn 1992 the US Department of Defense, along with the National Institute of Standards and Technology (NIST), cosponsored the Text Retrieval Conference (TREC) as part of the TIPSTER text program. The aim of this was to look into the information retrieval community by supplying the infrastructure that was needed for such a huge evaluation of text retrieval methodologies.\n\nWeb search engines such as Google and Lycos are amongst the most visible applications of information retrieval research.
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In the true meaning, information technology is anything (from a paper form to a cell phone or computer) that allows people to organize and share information.\n\nIt is the media that we use to store and communicate ideas.\n\nIn the usual meaning, it refers to electronic devices that do the above.  In this instance the organization of information can be quite advanced and includes the ability to search and otherwise process information.\n\nThe detailed part of your question sounds like a homework question.  You should be able to imagine how writing implements first changed the world and how cell phones and computing is currently doing so.
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Information technology is technology that is involved in the storage, management, manipulation, and communication of information.\n\nOne hundred years ago, if you wanted to remember something, you had to write it down.  You had to file it in a system so that you could remember it.  If anyone else wanted a copy, you had to reproduce it by hand.  If you knew something, like how much weight horses gained when you fed them different ways, you would have to compile the data by hand from several sources.  Interpreting data was difficult for this reason.  And if you wanted to learn something that had to be hands on, like surgery, you often had to travel very far very slowly to see it done in person.\n\nThese days it is possible to store inforation so that it is readily retrievable by many people.  You can examine data more easily.  It is easier to learn things and easier to share what you know.
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The World Wide Web ("WWW" or simply the "Web") is a global, read-write information space. Text documents, images, multimedia and many other items of information, referred to as resources, are identified by short, unique, global identifiers called Uniform Resource Identifiers (URIs) so that each can be found, accessed and cross referenced in the simplest possible way. The term is often mistakenly used as a synonym for the Internet itself, but the Web is actually something that is available via the Internet, just like e-mail and many other Internet services.\n\nhttp://en.wikipedia.org/wiki/World_wide_web
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Pro: Ready access to all sorts of information (most questions can be answered with an intelligent search)\n\nCon: Ready access to all sorts of information (adult material for children, inaccurate information posing as accurate)
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Designing a good search engine involves a lot of planning. The different components of a search engine are:\n1. A Bot / Crawler program that scans different websites and extracts the content.\n2. A parser program  that eliminates the HTML tags and other words that you dont wish to store.\n3. An Index - which is a list of keywords and link to the URL in which this was found.\n4. A Ranking algorithm that can assign some kind of weightage to the entries in the index to identify which entry in the index is more relevant for a keyword. This could get very complex so that the context of the content, relevancy, freshness, reliability of the content and many other factors are considered before a ranking is done.\n5. Storage architecture - The index could grow to phenomenal sizes (more so if not planned well) and so you need to decide what kind of storage you wish and how data can be retrieved quickly from many physical stores.\n6. A Web interface to query the index and display results appropriately.\n\nI'm no Guru in search engine tech - but briefly this is my understanding. Good luck!
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the collection, classification, storage, retrieval, and dissemination of recorded knowledge \n\nInformation Science
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Information technology (IT, also known as Information and Communication(s) Technology (ICT) and Infocomm, especially in Asia) is a broad subject concerned with technology and other aspects of managing and processing information, especially in large organizations.\n\nIn particular, IT deals with the use of electronic computers and computer software to convert, store, protect, process, transmit, and retrieve information. For that reason, computer professionals are often called IT specialists, and the division of a company or university that deals with software technology is often called the IT department. Other names for the latter are information services (IS) or management information services (MIS), managed service providers (MSP).\n\nIT (information technology) is a term that encompasses all forms of technology used to create, store, exchange, and use information in its various forms (business data, voice conversations, still images, motion pictures, multimedia presentations, and other forms, including those not yet conceived). It's a convenient term for including both telephony and computer technology in the same word. It is the technology that is driving what has often been called "the information revolution."
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information system is to manage your information like if you have school so that you can but the names of the students and there id numbers and ther home numbers with there family name then you collect all that information and but it n the computer so you now in the informaton system and but these infromations in program on your computer make it easyer for you to find what you want buy searching from key word that you wrote :)
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Information on what.....  use Yahoo and search for whatever you are looking for.
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Use the yahoo search to gather more information
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use the search engines like Google.
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Urmmm\n\nData information is information held by people, in most cases it refers to computer based information.
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Try something referred to as a Search Engine.
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Information is in the source
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search and search at the right place
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learn what is SEO  and how u can