What is the difference between an antibiotic and a disinfectant?

The other day during revision, I came across a question that sounded simple but sparked a real discussion: what’s the actual difference between an antibiotic and a disinfectant? I remembered reading in a CDC guideline how their uses are totally different—antibiotics are used inside the body to treat infections, while disinfectants are strictly for surfaces. This explanation really helped me clear the confusion.