What is an antibiotic? Mention the name of the first antibiotic discovered. Name the mould used for the production of the above antibotic .

Explanation

**Step-by-Step Solution:**

1. **Definition of Antibiotic:**
An antibiotic is a type of chemical substance that works against living organisms, particularly bacteria that cause diseases. The prefix "anti" means against, and "bio" refers to life. Therefore, antibiotics are substances that combat life forms that can cause harm, primarily bacteria.

2. **First Antibiotic Discovered:**
The first antibiotic to be discovered was Penicillin. It marked a significant breakthrough in medical science, allowing for effective treatment of bacterial infections.

...