Wikipedia is a free, collaborative, and multilingual web-oriented encyclopedia. It was incorporated in the year 2001. It is the largest and most popular encyclopedia, which is being used all over the world for reference work. It is supported by Wikimedia Foundation. There are approximately 18 million articles available in the directory of Wikipedia. These articles have been submitted by volunteers of Wikipedia. Most articles are in English language, while there are articles in almost all major languages of the different regions of the world.