How can one determine the classification of alkyl halides as primary, secondary, or tertiary?

Alkyl halides can be classified as primary, secondary, or tertiary based on the number of carbon atoms directly bonded to the carbon atom that is attached to the halogen. In a primary alkyl halide, there is one carbon atom bonded to the carbon-halogen bond. In a secondary alkyl halide, there are two carbon atoms bonded to the carbon-halogen bond. In a tertiary alkyl halide, there are three carbon atoms bonded to the carbon-halogen bond.