Animal testing involves experimenting on animals to test new drugs and cosmetics before they are used on humans. While it can help develop new medicines and ensure they are safe, over 1.5 million animals die in testing procedures each year, and some animals experience badly conducted tests. The article discusses both the potential benefits of animal testing in developing drugs like paracetamol as well as the drawbacks of the large number of animal deaths and instances of inhumane treatment that occur annually.