What is SEARCH ENGINES AND ONLINE DATA BASE??

Search Engines

• A web tool that allows users to enter keywords and find information on websites contained in its database.
• Search Engines like Google or Yahoo uses software that collects data from the Web to include in its database.
• Each search engine has its own database

Four Parts of a Search Engine

• Database to store references to Webpages.
• Web-Crawlers to find and compile indexes of Web Pages.
• User Interface.
• Information Retrieval System.

Data Base

• A storage where all indexed webpages are stored.
• Contains only essential information of a Webpage.
• This is where the user’s query is matched.

Web -Crawlers or Spiders

• An automated program or bot
• “Crawls” all over the Web Page collecting information

1. Keywords
2. Title
3. Synonyms
4. Access Frequency
5. Revelency

• Information is indexed and stored in database

Meta Search Engine

• A search engine that matches the user's query to multiple search engines

1. Meta Crawler
2. Savvy Search
3. Dog pile