Arminianism is "free will" theology according to Joseph (Jacobus) Arminius. It is the classic antithesis of Calvinism (predestination). Basically, in American terms, it is the difference between a Methodist and a Presbyterian.
Not really, though, because most people aren't worried about that stuff. Both concepts are true. That's the rub. We don't get it, because God's ways are not our ways. Often we are at a loss for satisfying explanations.
This can get confusing among Baptists. It depends on the Baptist who you are talking to. You can open a can of worms if you bring it up at the ice cream social.