Mr. Wikipedia, 

 I don't know what should I call it. An e book, free of cost or a person who helps me in everything.  

 I'm a university student. To buy books cost me tons on money. Wikipedia helps me save a lot of money which i would had rather spend it on expensive books. It is the best resource to get knowledge, and to teach yourself.  

 Not much of my friends use it but my professor recommend it to me. I first use it but didn't like that much. But as I start to use it on a daily basis, it helps me whatever i wanted to know and teach myself. And the best thing about Wikipedia is it helps me save my time. You just have to type in the topic and answer appears with the blink of an eye. As it is waiting for you.  

 Wikipedia is the resource available to everyone for free. It is not the property of the rich, but it is like a professor available worldwide. Even the poor people have access to it for free, who usually never spend money to buy books because they don't have it. 
 Wikipedia should had been be available at least 10 years ago. We can get from books, newspapers, Google but it is just too much you don't wanted to know. But Wikipedia shows you what we are actually looking for.