I think a meta-search engine uses another search engine/s to to look for its results so it does not have necessarily have to crawl and index all the Internet web pages.
A gateway is a group of librarians and researchers. A search engine is designed to search the internet for information.
The crawler The index The search engine software
A search engine has by default index all the data over the "world wide web server" and stored and index in his inbox after that provides as results for search queries on a especific keywords which searched by user.
Dense Index: An index record appears for every search key value in file. This record contains search key value and a pointer to the actual record. Sparse Index: Index records are created only for some of the records. To locate a record, we find the index record with the largest search key value less than or equal to the search key value we are looking for. We start at that record pointed to by the index record, and proceed along the pointers in the file (that is, sequentially) until we find the desired record. - - (ref: http://sawaal.ibibo.com/computers-and-technology/difference-between-sparce-index-dence-index-773764.html)
Spider , Index , Search and retrieval mechanism.
A data mining application is another name for a search engine. Or another name for a search engine is a computational statement of search and index.
A data mining application is another name for a search engine. Or another name for a search engine is a computational statement of search and index.
Search Engine just search inside index, without understand what you looking for and what exist inside the indexed documents, on other hand Answer Engine like Kngine (http://www.Kngine.com try to understand what this page speak about and extract information, so when you answer question like:UK Capital, Who is the director of Wanted, How many people live in Seattle, What is the distance between London and Berlinhe will provide direct and simple answer so you will not need to search and pore through the results.
A data mining application is another name for a search engine. Or another name for a search engine is a computational statement of search and index.
You can index your website to search engine such as Google, Yahoo and MSN by submitting your website to them. Google, Yahoo and MSN have pages on submitting website.
All the Internet is the biggest and best search engine on the Internet. It combines Google, Bing, Yahoo, Yandex & Wikipedia into one search engine. So it 3x the size of the Google search index.