To learn more about English Language.
Ex: If you were walking and a foreigner asked you where is the way going to the nearest Jollibee restaurant, then you can answer it properly because you have learned about the English Language. 

LOL . That's all :) Hope I helped
Sorry sa wrong grammar LOL

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Well, most of the people here in this world uses this language to communicate with other people in different countries. English is called the universal language, afterall. But, there are some people who uses this language to look educated (note: some)