What is an antibiotic? Give two examples.

Antibiotics, also known as antibacterials, are the medicines or drugs that help in preventing the infections caused by bacteria, by killing them or by preventing them from replicating or reproducing themselves.

Examples of antibiotics are penicillins, tetracyclines, cephalosporins, etc.

[Extra information:

Antibiotics are effective only against bacterial infections, but not effective against viral infections, such as the common cold or flu.

Penicillin was the first natural antibiotic discovered by Alexander Fleming.]