The word halal simply means permissible.
In regard to halal gelatin, this means that the gelatin was produced without any pig based products.
In the Islamic religion, this is a non-favorable animal.
This would refer to gelatin that was derived, even in a small way, from the remains of pigs.
The unique gelatinization, stability, healing, ointment, capsule and coating properties of gelatin make it the most widely used biodegradable compound in commercial food production, pharmaceutical and photographic industries.