A search engine is software accessed on the Internet that searches a database of information according to the user’s query. The engine provides a list of results that best match what the user is trying to find. Today, there are many different search engines available on the Internet, each with its own abilities and features. The first search engine ever developed is considered Archie, which was used to search for FTP files, and the first text-based search engine is considered Veronica. Currently, the most popular and well-known search engine is Google. Other popular search engines include AOL, Ask.com, Baidu, Bing, DuckDuckGo, and Yahoo.
How to find information on the Internet?
Most information is found on the Internet by utilizing search engines. A search engine is a web service that uses web robots to query millions of pages on the Internet and creates an index of those web pages. Internet users can then use these services to find information on the Internet.
Basic functions of Search Engines are :
Crawling :The crawler, or web spider, is a vital software component of the search engine. It essentially sorts through the Internet to find website addresses and the contents of a website for storage in the search engine database. Crawling can scan brand new information on the Internet or it can locate older data. Crawlers have the ability to search a wide range of websites at the same time and collect large amounts of information simultaneously. This allows the search engine to find current content on an hourly basis. The web spider crawls until it cannot find any more information within a site, such as further hyperlinks to internal or external pages.
Once the search engine has crawled the contents of the Internet, it indexes that content based on the occurrence of keyword phrases in each individual website. This allows a particular search query and subject to be found easily. Keyword phrases are the particular group of words used by an individual to search a particular topic.
The indexing function of a search engine first excludes any unnecessary and common articles such as “the,” “a” and “an.” After eliminating common text, it stores the content in an organized way for quick and easy access. Search engine designers develop algorithms for searching the web according to specific keywords and keyword phrases. Those algorithms match user-generated keywords and keyword phrases to content found within a particular website, using the index.
Storage: Storing web content within the database of the search engine is essential for fast and easy searching. The amount of content available to the user is dependent on the amount of storage space available. Larger search engines like Google and Yahoo are able to store amounts of data ranging in the terabytes, offering a larger source of information available for the user
Results: Results are the hyperlinks to websites that show up in the search engine page when a certain keyword or phrase is queried. When you type in a search term, the crawler runs through the index and matches what you typed with other keywords. Algorithms created by the search engine designers are used to provide the most relevant data first. Each search engine has its own set of algorithms and therefore returns different results.