Boogers are small, sticky clumps of dried mucus that form in the nose. Mucus is produced by the nasal passages to help trap dust, dirt, and germs, preventing them from entering the lungs. When mucus dries out, it can harden and become what we commonly refer to as boogers. Boogers can vary in color and texture, depending on factors like hydration and the presence of allergens or infections. While they may seem unpleasant, boogers play a role in keeping the respiratory system healthy by filtering out harmful particles and keeping the nasal passages moist.