THC and CBD are two different cannabinoids with varied effects.
THC exists in the highest levels in the cannabis plant and produces an infamous, psychoactive euphoria (it will get you high). It is helpful for treating pain management, insomnia, appetite stimulation, nausea, and reducing anxiety. THC also protects neural pathways making it effective for treating neurodegenerative disorders or nerve related pain like sciatica. (Pro-tip: THCa is non-psychoactive and converts to THC when heated. THCa is a great, non-intoxicating way to receive the incredible benefits of THC.)