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Difference between JoinColumn and mappedBy

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Although i know that, if there is uni directional relationship between two table's we use like this-

@JoinColumn(name="CarBillingId", referencedColumnName="car_billing_id", updatable=false)
protected CarBillingInfo carBillingInfo;

but if there is bidirectional relationship we use like this-


protected Car car;

but when i see the Apache Derby Database, the result's alook same(both car and carbillinginfo table's have same relationship in both ways). So what is the real difference between them which i can see.
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