Why do you need to improve English communication skills?

I would guess that you learn English because you would like to be able to speak correctly and communicate well with others and hopefully obtain the best possible job in the future. I am assuming of course that you live in an English-speaking country. I learned English firstly because it is a compulsory subject in school in New Zealand and secondly because I love to read books. Also I like to be able to speak English correctly as it is my language. How about you ? Why do you learn English ?
To avoid potentially embarrassing situations when you spell English incorrectly or can't form a proper question. :)