In order to find something on the Internet, users often turn to catalogs. However, it cannot help find some of the individual topics of interest to the user. Search engines come to the rescue in this case.
It is necessary
Personal computer with an Internet connection
Instructions
Step 1
The principles of search engines work are as follows. Many users naively think that after the introduction of the question, the search engine literally begins to wool the Internet. In reality, everything happens in a completely different way.
Step 2
The classic search engine has three main parts, namely the web spider, the indexer and the search algorithm, and the evaluation of the results.
Step 3
A spider web is a special program that runs on a personal computer that is connected to the Internet. The main task of this program is to search the Internet, that is, among its registered pages and in all possible directions. Pages are hyperlinks. Thus, the web spider traverses the hyperlinks and downloads from them pages for the second component of the search engine, namely the index base.
Step 4
Indexer is a handler for pages that have been downloaded by a web spider. This program extracts words from pages. She also adds them to an already formed search base, while writing down all the links where any word was found. This principle is used in the search engine.
Step 5
The search algorithm is the main innovation of the search engine. First of all, the efficiency of the result obtained during the search will depend on it, that is, the speed and accuracy of what the user can find. Thus, we can conclude that when the user has entered a certain query, the search engine searches for the answer in the index base, and the results are displayed using the search algorithm.
Step 6
For a search engine to work effectively, it is important that all three of its components work well. Moreover, the work of each component is associated with all sorts of tricky rules and tools that need to be constantly adjusted. Thus, for a search engine to work effectively, it must have a nimble and fast web spider, an efficient search algorithm, and a powerful index base.
Step 7
Relevance is the degree to which the received document matches the entered question. The search engine determines the degree of correspondence, that is, which of the pages given out on the request, where the desired string is found, will be the most interesting and useful to the user. This differentiates one search engine from another and determines its effectiveness.
