Search Engines and Database

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Hi people! quick question. What if one day you woke up and Google, Yahoo, Bing, Monzilla were to gone? What would you will happened?

Before that, those name I just said is call as search engines and every search engine has their own database.

 Search Engine is  a software program or script available through the Internet that searches documents and files for keywords and returns the results of any files containing those keywords.

 So basically I can conclude that:

•  Data base is where all the data or indexed webpages where stored.
• User interface is a friendly or common side/app/or page that user uses to find information.
• Web crawler is automated program or bot that crawled in search engines to find the information from the data base.
• Information retrieval system is a system used to match the user's query to indexed webpages found in data based.