Animal testing is the practice of using animals in experiments to better understand the effects of certain substances or treatments on living organisms. This research area has been controversial due to ethical concerns about the treatment of animals and the relevance of results obtained from animal studies to human health. Animal testing is commonly used in the fields of medicine, pharmacology, and toxicology to assess the safety and efficacy of new drugs, chemicals, and procedures. Researchers often use animals such as mice, rats, rabbits, and primates in these experiments, as their biological similarities to humans make them valuable models for studying biological processes and disease. However, advancements in technology and alternative methods like in vitro testing, computer modeling, and human cell cultures have led to a decrease in the use of animals in research.