I have arranged top 20 websites according to their rank in Alexa as of 13th February, 2015 in the world wide web and tried to give short description on each website. Those websites are world’s most popular, most visited and most famous websites and they are holding top most position in the world wide web in their field. Alexa Internet was founded in 1996 by American web entrepreneurs Brewster Kahle and Bruce Gilliat. The company’s name was chosen in homage to the Library of Alexandria. In 1999 Alexa was acquired by Amazon.com for US$250 million. Alexa provides traffic data, global rankings and other information over 30 million websites, and as by 2015 its website is visited by over 6.5 million people monthly.