What is the difference between custodial parent and non-custodial parent?

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The custodial parent is the term that is used for the parent that has primary physical custody of a child. Typically the child resides with the custodial parent.

The term non-custodial parent is used for the parent that has the child for a lesser amount of time. Typically the child does not reside with the non-custodial parent except during the time that the non-custodial parent exercises his/her visitation right with the child.

Typically, the child is either with the custodial parent or the non-custodial parent but not both. This arrangement comes as a result of the separation of the parents and both parents maintaining separate residences. The child resides with the custodial parent most of the time and the non-custodial parent spends time with the child during periods of child visitation. This way, both parents get to spend time with the child despite having separate residences.