Difference between client and customer I'd like to know what's the difference between "client" and "customer", or they're the same?

Learning English I would like to improve my English because I love travel and also I like to learn new lenguages. Moreover, I think that English is very important for my future, because I wolud like to go abroad and work in an international company. This is my last year at the University, so I think that it's a good moment for try to do something new.