Question

Why open source search engines are used in web with example?

Answer 1

Answer:

The Internet is a vast, addictive, reliable resource for consuming your entire afternoon, and there are users out there who use the search engines as a means of entertaining themselves. They look up things like videos, movie trailers, games, and social networking sites.

Open source simply means that the source code (programming) is available to anyone to use and modify as they desire. Search engines like Lucene[1], Nutch[2], Terrier[3], Xapian[4] and others are examples of Open Source search engines. They all allow you to change the code of the retrieval and ranking process.