It isn't the official language but It's the language is spoken throughout the world. The English is essencial for the comunication with people of the world.

I wouldn't say it's official. It seems to be kind of universal, but most people don't speak English as their firs language or at all. There are other languages that are used more often. I think people choose English because it's quite a simple language, comparing to other ones.

It's not official. It's universal. The reasons are historical. Study some recent history.

I think it's because it's quite simple comparing to other ones. It's also already one of official languages in places like India- former British colonies, or USA- which is quite important in the business world.

I think that's because it's the most spoken language in the world...