Then a list of addresses and keyword phrases that correspond to them , search robot keeps in its database . In addition, it also stores information about the frequency of occurrences of the word on the web-site with the use of the conditional value which is called the » weight of the word .» After analyzing all the data Google automatically generates lists of links , in which the data are sorted by weight, search words , and according to their location (the name of a Web resource , hyperlinks, meta tags , t , etc.). NOTE Not all users know that each search engine has its own mechanism for calculating the weight of keywords when scanning web pages . In many ways this is why different search engines on the same questions, offer different results . To find the required information , the user independently generates the appropriate search query and insert it into a search engine . As a rule, it displays search results sorted by relevance , ie corresponding to the detected web resources given search query. In this case, the first position in the list of results will belong links to web resources, containing a maximum of keywords from an input query. However, in some search engines , you can change the sort order of links in the search results — for example, by date ( at the beginning — a new web-based resources , and then — old ) , over the domain affiliation, price, etc. It is noteworthy that different search engines, despite the similarity of external tooling and almost the same , they have many hidden differences. This, for example , the procedure for determining the outcome of the search relevance , size and frequency of updating databases, ease of use , speed of processing and output results of the search , and etc. In addition , the search engines may differ to support query languages ??(one system can work with two — three languages ??, and the other — with a dozen languages) , the prioritization , the scanning area. It also often causes produce different search results from different search engines when you type them in the same query.