Tetrahydrocannabinol, commonly known as THC, is the primary psychoactive compound found in cannabis plants. Responsible for the “high” associated with marijuana, THC interacts with the body’s endocannabinoid system and affects mood, memory, appetite, and pain perception. THC is widely used both recreationally and medically, with research exploring its potential benefits for pain relief, nausea reduction, appetite stimulation, and certain neurological conditions. Different forms of THC, including Delta-9 THC and Delta-8 THC, offer varying effects and potency levels. Understanding how THC works, its potential therapeutic applications, side effects, legality, and differences from CBD can help consumers make informed decisions about cannabis products and wellness use.