Credit union, it was originally chosen for me by my parents a while back, they opend it for me back before i had a job and understood the concept of money, but also, if i ever need to take out a loan or anything like that, the interest rates are suppose to be lower because they credit unions are meant to be non-profit and run by the community for the community.
and yes, i am in high school and that was my definition i learned last year.