Marijuana is cannabis usually with high levels of THC (the part that makes you high, relieves severe pain, and can causes all the cardio and mental side effects like addiction, high hr or bp, etc) and low to no CBD. Hemp extracts only have 0.3% or less THC and anywhere from like 10-100% CBD and other cannabinoids, terpenes, etc so more commonly promoted for pain, inflammation, anxiety, cancer, some mental illnesses, seizures, etc.
Since the farm bill passed it's crazy how many kinds of hemp is out there everything from hemp flower to cbd nasal sprays and suppositories.