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Uncfred sorry :) THC and CBD are two cannabinoids present in marijuana.
THC is the active component in marijuana that gives the psychoactive effect (feeling 'high' or others experience it as a state of relaxation, more social etc), as well as associated physical impairment (effects on focus, reaction times etc.)
CBD doesn't generally produce a high, but may help some people with pain management, or inflammation. Different varieties of marijuana have been tweaked to provide different ratios of THC/CBD, depending on what effect, or purpose, the user is seeking.