Hemp (Cannabis sativa) is the same species of plant as cannabis. Unlike cannabis, hemp contains low levels of tetrahydrocannabinol (THC), less than 0.3%.
Both hemp and cannabis also contain cannabinoids such as CBD, cannabidivarin (CBDV), cannabigerol (CBG), and others. The 2018 Farm Bill established the specific definition of hemp versus cannabis by limiting the THC content of hemp to no more than 0.3%. Hemp seeds contain fats, protein, and other chemicals. People use hemp for constipation, high cholesterol, eczema, arthritis, and various conditions, but there is no solid evidence to support this use.
Do not combine hemp with Canadian hemp, farm hemp, cannabis or cannabidiol (CBD). They are not the same. Unlike cannabis, it is legal to sell hemp and hemp products under US government law.