Antibiotic Vs Antiseptic .

Antibiotic - a medicine or chemical that can destroy harmful bacteria in the body or limit their growth: examples : savlon, germonline, dettol etc.
Antiseptic -a chemical used for preventing infection in an injury, especially by killing bacteria., like a preventive measure.
Example:
When you cut yourself, you would use antiseptic lke savlon, germonline, dettol etc to clean the wound and kill any germs/bacteria that might have got it. If you were unfortunate enough for the cut to get infected, the Doc would prescribe antibiotics.