Bisexual vs bi curious?

what's the difference between bisexual and bi-curious?Also if a girl has done everything but had sex with the same gender,does that make them bicurious or bisexual?
Update: because I keep hearing different things from people.
Update 2: if the person is more into the same gender but never sexually intimate is it still called bi-curious?
Update 3: if someone dates both genders just only been sexually active with one gender.. that makes them bi-curious?
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