Toxins are harmful substances that can cause damage to living organisms. They can be produced by various sources, including plants, animals, and bacteria. For example, some mushrooms produce toxins that can be poisonous if ingested, while certain bacteria can release toxins that lead to illness. Toxins can enter the body through different routes, such as ingestion, inhalation, or skin contact. Once inside, they can disrupt normal biological functions, leading to symptoms ranging from mild irritation to severe health issues. Understanding toxins is essential for preventing exposure and protecting public health.