Improving other language skills, meeting new people, learning about other country, it's culture.
More experience, upgrading your language, learning something unique
To adapt
More affordable education with prospects of working in the country?
You're qualified in more countries most of the time, international relations and skills to converse with people of different cultures. I think those are the main advantages, but there's a lot more of them.
Good
Better education, new cultures
Seeing more world, new skills/experince.
You have a bigger perspective for a job and future after you graduate.