Marijuana
Marijuana is the term given to recreational cannabis, which has psychoactive and physiological effects when consumed.  These effects include a feeling of relaxation, euphoria (the ‘high’ or ‘stoned’ feeling), a general alteration of conscious perception and increased awareness of sensations, amongst others.  Marijuana is typically unregulated, which means that quality, efficacy and safety is not guaranteed, and in some cases may produce unwanted side effects.
Hemp
Hemp is a variety of cannabis containing very low levels of THC and/or higher concentrations of CBD.  It is grown primarily for industrial purposes, such as to produce textiles, food, and building materials.