Pepper spray is a self-defense tool that contains a chemical compound derived from chili peppers, known as capsaicin. It is designed to temporarily incapacitate an attacker by causing intense irritation to the eyes, skin, and respiratory system. When sprayed, it creates a burning sensation and can lead to temporary blindness, allowing the user to escape from a dangerous situation. Typically sold in small canisters, pepper spray is easy to carry and use. It is legal in many places, but regulations vary by location, so it's important to check local laws before purchasing or carrying it.