Uses of English language?

It depends on the society. For example in Singapore, English is used as a common platform for the people to communicate because the society is multi-racial and speak many different languages.

Globally, English is used to facilitate business and trade because it is a majority language, but do note that it is not the only majority language used.

On an individual level, I think English also help to provide a sense of belonging? Since it is a majority language, knowing English makes someone feel like a part of a bigger group of people as they are able to share their thoughts and interests via communication with a larger group of people.