why do we need to have english for specific purpose

[Ayda]

Hi,
The main purpose for me to learn English is to graduate from the college with flying color. Because at my college English is the most important thing and I have to be very good at it to graduate with high marks. However, I also learn English because I believe it is the language of communicating with other people around the world. Therefore, if I travel to other countries around the world it will be easy to deal with people and to understand them because most people know English.